CVE-2026-31976— xygeni-action v5 tag poisoned with C2 backdoor
Quick assessment
Affected
xygeni xygeni-action
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
xygeni-action是Xygeni开源的一个GitHub代码安全扫描工作流插件。 xygeni-action存在安全漏洞，该漏洞源于标签投毒，可能导致供应链攻击，使攻击者能够在CI运行器上执行任意命令。
Possible ATT&CK Techniques 3 AI
T1105 · Ingress Tool Transfer T1059 · Command and Scripting Interpreter T1588.006 · Vulnerabilities
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I. Basic Information for CVE-2026-31976
Vulnerability Information
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Vulnerability Title
xygeni-action v5 tag poisoned with C2 backdoor
Source: CVE Program / CVE List V5
Vulnerability Description
xygeni-action is the GitHub Action for Xygeni Scanner. On March 3, 2026, an attacker with access to compromised credentials created a series of pull requests (#46, #47, #48) injecting obfuscated shell code into action.yml. The PRs were blocked by branch protection rules and never merged into the main branch. However, the attacker used the compromised GitHub App credentials to move the mutable v5 tag to point at the malicious commit (4bf1d4e19ad81a3e8d4063755ae0f482dd3baf12) from one of the unmerged PRs. This commit remained in the repository's git object store, and any workflow referencing @v5 would fetch and execute it. This is a supply chain compromise via tag poisoning. Any GitHub Actions workflow referencing xygeni/xygeni-action@v5 during the affected window (approximately March 3–10, 2026) executed a C2 implant that granted the attacker arbitrary command execution on the CI runner for up to 180 seconds per workflow run.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
内嵌的恶意代码
Source: CVE Program / CVE List V5
Vulnerability Title
xygeni-action 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
xygeni-action是Xygeni开源的一个GitHub代码安全扫描工作流插件。 xygeni-action存在安全漏洞，该漏洞源于标签投毒，可能导致供应链攻击，使攻击者能够在CI运行器上执行任意命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| xygeni | xygeni-action | >= March 3, 2026, <= March 10, 2026 | - |
|
II. Public POCs for CVE-2026-31976
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-31976 (2)
-
Malicious code · Issue #54 · xygeni/xygeni-action x_refsource_MISC
IV. Related Vulnerabilities
Same weakness: CWE-506
V. Comments for CVE-2026-31976
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