CVE-2026-121353VulnerabilityPublished 11 Nov 2026

Adobe Connect is affected by an Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability that could

Source GCVE Database

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Authoritative record:CVE-2026-121353· Critical 10.0

Not known to be exploited · CVSS 10.0 Critical.

Data as of 11 Nov 2026, 01:47 UTC

CVSS 3.1 base score

10.0Critical

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

Thin evidence

One scorer or none

CVSS scores by source
CNA (adobe)	CVSS 3.1	10.0

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Changed
Confidentiality: High
Integrity: High
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: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
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: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to 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 10 Nov 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 10 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.

ghsa-88jj-hxc9-3gm2

What to do

Affected software

Product	Affected	Fixed in
AdobeAdobe Connect	Affected <=12.8	Fixed in–
AdobeAdobe Connect	Affected <=12.9	Fixed in–
AdobeAdobe Connect	Affected <=12.10	Fixed in–
AdobeAdobe Connect	Affected <=12.11	Fixed in–
AdobeAdobe Connect	Affected <=12.12	Fixed in–

AI-suggested

Until a fix is available, consider applying any recommended temporary mitigations from Adobe or restricting network access to Adobe Connect instances if feasible.

Description

Adobe Connect has a critical vulnerability classified as Improper Neutralization of CRLF Sequences (CRLF Injection). This flaw could allow an attacker to execute arbitrary code within the context of the current user without requiring any user interaction. The vulnerability has a scope change, indicating that it may affect components beyond the initially vulnerable code. The CVSS score is 10.0, reflecting its critical severity and potential for complete confidentiality and integrity compromise without availability impact.

Impact

Successful exploitation allows an attacker to execute arbitrary code as the current user, potentially leading to elevated access or control over the victim's account or session. This can result in complete compromise of confidentiality and integrity of the affected system or data. There is no indication of availability impact. The vulnerability can be exploited remotely without user interaction, increasing its risk.

Summary

CVE-2026-121353 describes a CRLF Injection vulnerability in Adobe Connect that enables arbitrary code execution in the context of the current user. The vulnerability does not require user interaction and has a scope change, which may imply privilege escalation or impact beyond the original component. The CVSS 3.1 vector indicates network attack vector, low attack complexity, no privileges required, no user interaction, changed scope, and high confidentiality and integrity impact.

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 11 Nov 2026, 01:47 UTC

WeaknessesCWE-93

Technical details

References

Community reviews

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