Authenticated GitHub token theft via absolute URLs
Published Sep 14, 2026 · Updated Sep 14, 2026
SSRF in Cosmic Stack Mercury Agent 1.1.0 through 1.1.13 allows remote authenticated users to steal GitHub tokens via absolute URLs. The githubRequest function in src/utils/github.ts trusts path values beginning with http as destination overrides while still attaching the configured GitHub bearer token. The web dashboard must be enabled, GITHUB_TOKEN configured, and the attacker authenticated; exposed token scopes bound repository access and modification.
Summary
What happened
SSRF in Cosmic Stack Mercury Agent 1.1.0 through 1.1.13 allows remote authenticated users to steal GitHub tokens via absolute URLs. The githubRequest function in src/utils/github.ts trusts path values beginning with http as destination overrides while still attaching the configured GitHub bearer token. The web dashboard must be enabled, GITHUB_TOKEN configured, and the attacker authenticated; exposed token scopes bound repository access and modification.
The record
- CVE
- CVE-2026-90814
- Published
- Sep 14, 2026
- Updated
- Sep 14, 2026
- Vendor
- Cosmic Stack
- Product
- Mercury Agent
- Classifications
- CWE-918, T1528
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 14, 2026CVE publishedPublication date reported by the CVE source.
- Sep 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.1.0
- Affected versionversion=1.1.1
- Affected versionversion=1.1.10
- Affected versionversion=1.1.11
- Affected versionversion=1.1.12
- Affected versionversion=1.1.13
- Affected versionversion=1.1.2
- Affected versionversion=1.1.3
- Affected versionversion=1.1.4
- Affected versionversion=1.1.5
- Affected versionversion=1.1.6
- Affected versionversion=1.1.7
- Affected versionversion=1.1.8
- Affected versionversion=1.1.9
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Mercury github_api token-exfiltration proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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