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TI-2026-80991 Aliases CVE-2026-116827GHSA-fcvr-25qj-4jg8

Server-side request forgery in YesWiki Bazar CSV import

Priority HIGH 69CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-918 and the CVSS impact.

Summary

YesWiki before 4.7.0 contains a server-side request forgery flaw in the Bazar CSV import copyUrlToLocalFile() function, tracked as CWE-918. An authenticated administrator can make arbitrary outbound requests by supplying crafted URLs in CSV file or image fields. The extension check can be bypassed with a query-string suffix or redirects, so responses can be stored in the web-accessible files/ directory. Attackers can use this to reach cloud metadata credentials, internal services, or local files via file://.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Description from the CNA

YesWiki before 4.7.0 contains a server-side request forgery vulnerability in the Bazar CSV import copyUrlToLocalFile() function that allows authenticated administrators to make arbitrary outbound requests by supplying crafted URLs in CSV file or image fields. Attackers can bypass the extension check with a query-string suffix or redirects to fetch cloud metadata credentials, internal services, or local files via file://, with responses stored in the web-accessible files/ directory.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00345 28th percentileScored 2026-11-07
Fix Fixed yeswiki (YesWiki): 4.7.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
YesWikiyeswikibefore 4.7.04.7.0Patch availableCNA
  • yeswiki VendorYesWiki Affected before 4.7.0 Fixed in 4.7.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:yeswiki:yeswiki:*:*:*:*:*:*:*:*——YesWiki
  • cpe:2.3:a:yeswiki:yeswiki:*:*:*:*:*:*:*:* Versions — — ·YesWiki

Remediation

Upgrade YesWiki to version 4.7.0 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

  • Fix · CNA yeswiki (YesWiki) Fixed in 4.7.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    yeswiki 4.7.0

    9 records Highest priority Priority HIGH 3 HIGH, 4 MEDIUM, 2 LOW

    Other records, highest priority first

    • TI-2026-80984 SQL query disclosure in YesWiki via showreq parameterPriority HIGH 70
    • TI-2026-80989 HTTP Signature replay in YesWiki ActivityPub inbox allows repeated actionsPriority HIGH 69
    • TI-2026-80992 SQL injection in YesWiki despam.php via INTERVAL operandPriority MEDIUM 64
    Show all 9 records →

Timeline

  1. 2026-10-26 Threatist record created from CVE-2026-116827
  2. 2026-10-27 Alias added: GHSA-fcvr-25qj-4jg8
  3. 2026-10-27 Priority changed: MEDIUM → LOW
  4. 2026-11-03 CISA SSVC decision points changed
  5. 2026-11-03 Priority changed: LOW → HIGH

References

Advisory 1

  • TI-2026-37893 YesWiki has Unsafe eval() in Formula Calculator - Remote Code Execution (RCE) & Denial of Service (DoS) CVSS 3.1CRITICAL 9.8
  • TI-2026-34305 YesWiki: Unauthenticated SQL Injection CVSS 3.1CRITICAL 9.8
  • TI-2025-29089 YesWiki Vulnerable to Unauthenticated Site Backup Creation and Download CVSS 3.1CRITICAL 10.0
  • TI-2024-34399 Use of a Broken or Risky Cryptographic Algorithm in YesWiki CVSS 3.1CRITICAL 9.9
  • TI-2026-37882 YesWiki: Unauthenticated arbitrary page deletion via `{{erasespamedcomments}}` action CVSS 3.1CRITICAL 9.1
  • TI-2026-80227 SQL injection in YesWiki Bazar entry creation via date_maj_fiche CVSS 4.0HIGH 8.8
See all 85 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences