Adobe Content Credentials SDK: Improper signature verification enables security bypass
Summary
CVE-2026-122100 affects the Adobe Content Credentials Rust SDK (c2pa) up to c2pa-v0.91.10 and C2PA Tool (c2patool) up to c2patool-v0.28.5. Improper verification of a cryptographic signature could allow an attacker to bypass security measures and potentially gain unauthorized write access. Exploitation requires a local attack vector and user interaction, such as a victim visiting a malicious URL or interacting with a compromised web page.
Affected
- Adobe Content Credentials Rust SDK (c2pa) through c2pa-v0.91.10
- Adobe C2PA Tool (c2patool) through c2patool-v0.28.5
- All platforms
Fixed in
- Content Credentials Rust SDK: c2pa-v0.91.11 or later
- C2PA Tool: c2patool-v0.28.6 or later
Workaround
- Unknown. No vendor-documented workaround. Updating is the recommended remedy.
Exploitation
- Adobe is not aware of any exploits in the wild.
- OffSeq lists the CVE as not known to be exploited.
- No public proof of concept found. Not listed in CISA KEV as far as checked.
Our recommendation
- Inventory systems, build agents and applications that use the c2pa SDK or c2patool.
- Update to c2pa-v0.91.11 or c2patool-v0.28.6 on the normal patch cycle, including build images.
- Confirm the fixed versions against Adobe advisory APSB26-184 before rollout.
- Priority for most SMEs is low to medium, as the components are not general office or desktop software.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Adobe Security Bulletin APSB26-184 www.adobe.com
- CVE.org CVE Record CVE-2026-122100 www.cve.org
- OffSeq threat radar CVE-2026-122100 radar.offseq.com
- Strix CVE-2026-122100 www.strix.ai
- HKCERT Adobe monthly security update November 2026 www.hkcert.org
- ZDI November 2026 security update review www.zerodayinitiative.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 16:10.
Original description (NVD)
CAI Content Credentials is affected by an Improper Verification of Cryptographic Signature vulnerability that could result in a Security feature bypass. An attacker could leverage this vulnerability to bypass security measures and gain unauthorized write access. Exploitation of this issue requires user interaction in that a victim must visit a maliciously crafted URL or interact with a compromised web page.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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