VulnerabilityPublished 22 Jun 2026

CVE-2026-11748: LY Central Dogma · LDAP Injection

Affects LY Central DogmaSource CVE Database V5

Compare

Not known to be exploited · CVSS 6.9 Medium · patch available : update LY Central Dogma when convenient.

Data as of 5 Nov 2026, 23:24 UTC

CVSS 4.0 base score

6.9Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.4% chance of exploitation in 30 days – higher than 41% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: None
User Interaction: None
Vulnerable system confidentiality: Low
Vulnerable system integrity: Low
Vulnerable system availability: None
Subsequent system confidentiality: Low
Subsequent system integrity: None
Subsequent system availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Subsequent System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 22 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
LY CorporationCentral Dogma	Affected–	Fixed in–

AI-suggested

If you cannot patch yet, consider restricting access to the authentication service and applying LDAP input validation or filtering as a temporary mitigation if feasible.

Description

# Vulnerability `SearchFirstActiveDirectoryRealm.findUserDn()` substitutes the user-supplied username from the login form into an LDAP search filter template (default `cn={0}`) **without escaping RFC 4515 filter metacharacters** (`*`, `(`, `)`, `\`, NUL). Combined with `SearchControls.setCountLimit(1)` on the same call site, this allows three distinct attack primitives: 1. **Authentication confusion** — typing username `*` causes the realm to construct filter `cn=*`, return the first directory entry (typically a privileged account in AD ordering), and attempt bind against that DN with the attacker's password. 2. **Audit log evasion** — payload `bob)(uid=alice` is recorded verbatim in audit logs while the realm searches with the malformed filter, breaking accountability/compliance (SOX, PCI-DSS, ISO 27001). 3. **Directory enumeration** — wildcards and timing differences allow reconnaissance of OU structure and admin group membership. A repo-wide search for any LDAP escape helper (`escapeLdap`, `encodeFilter`, `escapeFilter`, `ldapEscape`) returns **zero hits** — the defense is not just missing, it was never added. > **Applicability note:** This realm is opt-in. The shipped default LDAP example (`dist/src/conf/shiro.example.ldap.ini`) uses Shiro's `DefaultLdapRealm` with `userDnTemplate` and is **NOT** affected. However, the realm exists precisely to support Active Directory environments where users log in via `sAMAccountName` and the realm must search for the DN first — the canonical LINE corporate AD-backed SSO scenario. Internal deployments using AD-backed login almost certainly select this realm. --- ## Evidence **File:** `server-auth/shiro/src/main/java/com/linecorp/centraldogma/server/auth/shiro/realm/SearchFirstActiveDirectoryRealm.java` **Lines 148–176** on branch `main` @ commit `d64a5151`: ```java @Nullable protected String findUserDn(LdapContextFactory ldapContextFactory, String username) throws NamingException { LdapContext ctx = null; try { ctx = ldapContextFactory.getSystemLdapContext(); final SearchControls ctrl = new SearchControls(); ctrl.setCountLimit(1); // line 156 — returns FIRST match only ctrl.setSearchScope(SearchControls.SUBTREE_SCOPE); ctrl.setTimeLimit(searchTimeoutMillis); final String filter = searchFilter != null ? USERNAME_PLACEHOLDER.matcher(searchFilter) .replaceAll(username) // line 162 — RAW SUBSTITUTION : username; // line 163 final NamingEnumeration result = ctx.search(searchBase, filter, ctrl); ... ``` `USERNAME_PLACEHOLDER = Pattern.compile("\\{0}")`. Default `searchFilter = "cn={0}"`. ### Data flow from HTTP login to vulnerable substitution | Step | Component | |------|-----------| | HTTP login form | `POST /api/v1/login` form field `username` | | `ShiroLoginService.usernamePassword()` (lines 198–223) | applies `loginNameNormalizer` (Unicode lowercase only — **NOT** LDAP escape) | | `Subject.login(new UsernamePasswordToken(username, password))` | Shiro hand-off | | `ActiveDirectoryRealm.doGetAuthenticationInfo` (Shiro core) | calls `queryForAuthenticationInfo0` | | `SearchFirstActiveDirectoryRealm.findUserDn(factory, upToken.getUsername())` | username flows in **verbatim** | ### Repository-wide escape helper grep | Search term | Hits | |-------------|------| | `escapeLdap` | 0 | | `encodeFilter` | 0 | | `escapeFilter` | 0 | | `ldapEscape` | 0 | --- ## PoC Self-contained JUnit 5 test using UnboundID `InMemoryDirectoryServer` (in-process, no external LDAP required). Drop into `server-auth/shiro/src/test/java/com/linecorp/centraldogma/server/auth/shiro/realm/LdapInjectionPoCTest.java` and add `com.unboundid:unboundid-ldapsdk:7.0.0` as a test dependency. > The PoC works by subclassing the realm and overriding `findUserDn()` to capture the actual LDAP filter string sent to the directory — the captured filter is the structural evidence, independent of LDAP server strictness about bind outcomes. ```java /* * Copyright 2026 LINE Corporation * * SECURITY PoC — NOT FOR MERGE INTO THE MAIN TEST SUITE. * * This JUnit class demonstrates the LDAP filter injection in * SearchFirstActiveDirectoryRealm. Drop into * server-auth/shiro/src/test/java/com/linecorp/centraldogma/server/auth/shiro/realm/ * Adds the UnboundID LDAP SDK as a test dep. */ package com.linecorp.centraldogma.server.auth.shiro.realm; import static org.assertj.core.api.Assertions.assertThat; import static org.assertj.core.api.Assertions.assertThatThrownBy; import javax.naming.directory.SearchControls; import javax.naming.ldap.LdapContext; import org.apache.shiro.realm.ldap.JndiLdapContextFactory; import org.apache.shiro.realm.ldap.LdapContextFactory; import org.junit.jupiter.api.AfterAll; import org.junit.jupiter.api.BeforeAll;

Impact

An unauthenticated attacker can exploit this vulnerability to manipulate LDAP search filters, potentially causing authentication confusion and enabling enumeration of the directory structure. This may lead to unauthorized information disclosure about the directory and could complicate authentication processes, but does not directly allow privilege escalation or code execution based on the available data.

Summary

The vulnerability CVE-2026-11748 affects centraldogma-server-auth-shiro versions prior to 0.84.0. It is caused by improper sanitization of LDAP filter input in the SearchFirstActiveDirectoryRealm, where the login username is directly substituted into the LDAP search filter without escaping LDAP metacharacters. This can be exploited by unauthenticated attackers to manipulate the LDAP query, leading to authentication confusion and directory enumeration. The CVSS 4.0 base score is 6.9, indicating a medium severity with network attack vector, low attack complexity, no privileges or user interaction required, and limited confidentiality and integrity impact.

CWE-90Improper Neutralization of Special Elements used in an LDAP Query (LDAP Injection) (opens in a new tab)
Base weaknessOWASP Top 10 A05:2025: Injection (opens in a new tab)
The product constructs all or part of an LDAP query using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended LDAP query when it is sent to a downstream component.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
OWASP Cheat Sheets
LDAP Injection Prevention (opens in a new tab)
Abuse Case (opens in a new tab)
Deserialization (opens in a new tab)
Injection Prevention (opens in a new tab)
SQL Injection Prevention (opens in a new tab)
OWASP ASVS 4.0.3
V5.3.7 (opens in a new tab)
V1.5.1 (opens in a new tab)
Attack patterns
LDAP Injection (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

github.com/line/centraldogma/security/advisories/GHSA-98q5-5qh2-7w75 (opens in a new tab)

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 22 Jun 2026, 14:13 UTC

WeaknessesCWE-90

Technical details

References

Community reviews

Related threats