VulnerabilityPublished 16 Jan 2026

CVE-2026-0616: TheLibrarian.io · Exposure of Sensitive System Information to an Unauthorized Control Sphere

Affects TheLibrarian.ioSource CVE Database V5

Not known to be exploited · CVSS 7.5 High.

Data as of 26 Oct 2026, 10:12 UTC

CVSS 3.1 base score

7.5High

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

EPSS: 0.3% chance of exploitation in 30 days – higher than 30% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

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

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, 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: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 16 Jan 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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
TheLibrarianTheLibrarian.io	Affected <=1.0	Fixed in–

AI-suggested

Immediately apply the vendor-provided patches for TheLibrarian.io to all affected systems to close the vulnerability.
Restrict network access to the Adminer interface by implementing strict firewall rules or network segmentation, ensuring only authorized administrative hosts can reach it.
Employ strong authentication and access controls on all backend management interfaces, even if not directly exposed to the internet.
Monitor logs and network traffic for unusual access patterns or attempts to retrieve Adminer content via the web_fetch tool.
Conduct regular security audits and penetration tests focusing on internal management interfaces to detect potential exposures.
Consider deploying web application firewalls (WAFs) with custom rules to block unauthorized attempts to access sensitive backend endpoints.
Educate system administrators about the risks of exposing internal tools and enforce secure configuration baselines. These steps go beyond generic patching by emphasizing network-level controls, monitoring, and proactive security hygiene.

Description

CVE-2026-0616 is a high-severity vulnerability in TheLibrarian.io's web_fetch tool that allows unauthorized users to retrieve the Adminer interface content. This exposure enables attackers to access the internal backend system without authentication, compromising sensitive system information. The vulnerability does not require user interaction or privileges and can be exploited remotely over the network. Although no known exploits are currently in the wild, the flaw poses a significant confidentiality risk. The vendor has released patches addressing this issue in all affected versions. European organizations using TheLibrarian.io should prioritize patching to prevent unauthorized backend access. Countries with higher adoption of TheLibrarian.io or critical infrastructure relying on it are at greater risk.

Impact

For European organizations, this vulnerability poses a significant risk to the confidentiality of sensitive backend systems managed via TheLibrarian.io. Unauthorized access to the Adminer interface could allow attackers to gather critical system information, potentially leading to data breaches or further compromise of internal systems. Organizations in sectors such as finance, healthcare, government, and critical infrastructure that rely on TheLibrarian.io for backend management are particularly vulnerable. The exposure could facilitate lateral movement within networks or unauthorized data extraction. Given the vulnerability requires no authentication and can be exploited remotely, the attack surface is broad. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, especially if threat actors develop exploits. Failure to patch promptly could result in severe confidentiality breaches, regulatory non-compliance (e.g., GDPR), and reputational damage.

CWE-497Exposure of Sensitive System Information to an Unauthorized Control Sphere (opens in a new tab)
Base weaknessOWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The product does not properly prevent sensitive system-level information from being accessed by unauthorized actors who do not have the same level of access to the underlying system as the product does.
Architecture and Design · Implementation
Production applications should never use methods that generate internal details such as stack traces and error messages unless that information is directly committed to a log that is not viewable by the end user.
OWASP Cheat Sheets
Error Handling (opens in a new tab)
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V14.3.2 (opens in a new tab)
V8.3.4 (opens in a new tab)
V14.3.3 (opens in a new tab)
Attack patterns
Web Application Fingerprinting (opens in a new tab)
System Location Discovery (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 23 Jan 2026, 20:34 UTC

WeaknessesCWE-497

Technical details

References

Community reviews

Related threats