Authenticated internal-response disclosure via hostname validation bypass
Published Apr 2, 2026 · Updated Apr 2, 2026
SSRF in SillyTavern before 1.17.0 allows remote authenticated users to read responses from internal services on default ports. The /api/search/visit handler in src/endpoints/search.js applies a dotted-quad IPv4 regex to the supplied hostname, so localhost, IPv6 loopback, and DNS names resolving to internal addresses evade the destination check. A valid session or disabled CSRF protection is required, and the port check restricts requests to services on default ports 80 and 443.
Summary
What happened
SSRF in SillyTavern before 1.17.0 allows remote authenticated users to read responses from internal services on default ports. The /api/search/visit handler in src/endpoints/search.js applies a dotted-quad IPv4 regex to the supplied hostname, so localhost, IPv6 loopback, and DNS names resolving to internal addresses evade the destination check. A valid session or disabled CSRF protection is required, and the port check restricts requests to services on default ports 80 and 443.
The record
- CVE
- CVE-2026-34526
- Published
- Apr 2, 2026
- Updated
- Apr 2, 2026
- Vendor
- SillyTavern
- Product
- SillyTavern
- Classifications
- CWE-918, CAPEC-664, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 2, 2026CVE publishedPublication date reported by the CVE source.
- Apr 2, 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=< 1.17.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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
- SillyTavern /api/search/visit SSRF proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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