VulnerabilityPublished 12 Jun 2026Updated 7 Aug 2026

CVE-2026-50629: Apache CXF · CRLF Injection

Affects Apache CXFSource CVE Database V5

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Not known to be exploited · CVSS 5.3 Medium · fixed in 4.2.2 : update Apache CXF when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score

5.3Medium

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

EPSS: 0.4% chance of exploitation in 30 days – higher than 37% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 4.2.2, 4.1.7, 3.6.12

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: Low
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: None: There is no loss of confidentiality within the impacted component.
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 on 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 12 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 30 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.
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.

ghsa-f8p7-h97q-7vx7

What to do

Upgrade Apache to 4.2.2, 4.1.7 or 3.6.12.

Affected software

Product	Affected	Fixed in
Apache Software FoundationApache CXF	Affected >=4.2.0 <4.2.2	Fixed in 4.2.2
Apache Software FoundationApache CXF	Affected >=4.0.0 <4.1.7	Fixed in 4.1.7
Apache Software FoundationApache CXF	Affected <3.6.12	Fixed in 3.6.12
MavenApache Software Foundation/org.apache.cxf:cxf-rt-rs-security-oauth2`pkg:maven/Apache Software Foundation/org.apache.cxf:cxf-rt-rs-security-oauth2`Other threats	Affected >=4.2.0 <4.2.2 >=4.0.0 <4.1.7 <3.6.12	Fixed in 4.2.2 4.1.7 3.6.12

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Users should upgrade Apache CXF to versions 4.2.2, 4.1.7, or 3.6.12 where this issue is fixed. No other mitigation or temporary workaround is indicated. Patch status is confirmed by the vendor advisory recommending these versions.

Description

CVE-2026-50629 is a medium severity vulnerability in Apache CXF where the 'clientId' parameter from HTTP requests is directly concatenated into OAuth2 server log warning messages without sanitizing control characters. This improper neutralization of CRLF sequences allows attackers to inject arbitrary content, including fake log entries, into server logs. The issue is fixed in Apache CXF versions 4.2.2, 4.1.7, and 3.6.12.

Impact

An attacker can inject arbitrary content, including fake log entries, into the server's log files by exploiting the lack of sanitization of the 'clientId' parameter in log messages. This can lead to log pollution, potentially misleading administrators or automated systems that rely on log data for security monitoring and incident response. There is no direct impact on confidentiality or availability reported.

CWE-93Improper Neutralization of CRLF Sequences (CRLF Injection) (opens in a new tab)
Base weaknessOWASP Top 10 A05:2025: Injection (opens in a new tab)
The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.
Implementation
Avoid using CRLF as a special sequence.
Implementation
Appropriately filter or quote CRLF sequences in user-controlled input.
OWASP Cheat Sheets
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)
Injection Prevention in Java (opens in a new tab)
OWASP ASVS 4.0.3
V1.5.1 (opens in a new tab)
Attack patterns
Command Delimiters (opens in a new tab)
Web Server Logs Tampering (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 14 Aug 2026, 16:23 UTC

WeaknessesCWE-93

Technical details

References

Community reviews

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