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PatchSiren cyber security CVE debrief

CVE-2026-16027 Revenue Administration CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-07T08:16:46.023Z and has not been modified since then. This Server-Side Request Forgery (SSRF) vulnerability affects Türkiye's E-Signature, specifically versions from 2.4.4.0 before 2.5.1.0. The vulnerability allows an attacker to make unauthorized requests on behalf of the server. Evidence is limited; verify vulnerability details with primary official records. The CVE Program and NVD provide official information. Limited source detail suggests verifying affected versions, especially between 2.4.4.0 and 2.5.1.0, and reviewing system configurations for potential SSRF vulnerabilities.

Vendor
Revenue Administration
Product
E-Signature
CVSS
MEDIUM 5.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-07
Original CVE updated
2026-08-26
Advisory published
2026-08-07
Advisory updated
2026-08-26

Who should care

Administrators and users of Türkiye's E-Signature, especially those using versions between 2.4.4.0 and 2.5.1.0, should verify and apply patches to prevent potential SSRF attacks. Security teams and vulnerability management teams should prioritize verification and remediation efforts for this vulnerability, considering the potential impact on sensitive data and system integrity. Additionally, operators and platform administrators should review system configurations and implement compensating controls if patches cannot be applied immediately.

Technical summary

CVE-2026-16027 is a Server-Side Request Forgery (SSRF) vulnerability in Türkiye's E-Signature, affecting versions from 2.4.4.0 before 2.5.1.0. The vulnerability allows an attacker to make unauthorized requests on behalf of the server. This issue has a CVSS score of 5.4 and a severity of MEDIUM. Administrators and users of Türkiye's E-Signature, especially those using versions between 2.4.4.0 and 2.5.1.0, should verify and apply patches to prevent potential SSRF attacks.

Defensive priority

Verify and inventory vulnerable Türkiye's E-Signature instances, especially versions between 2.4.4.0 and 2.5.1.0.

Recommended defensive actions

  • Inventory and verify Türkiye's E-Signature instances, especially versions between 2.4.4.0 and 2.5.1.0.
  • Implement compensating controls, such as validating and sanitizing user input.
  • Monitor for suspicious activity and exception tracking.

Evidence notes

Evidence is limited; verify vulnerability details with primary official records. The CVE Program and NVD provide official information. Limited source detail suggests verifying affected versions, especially between 2.4.4.0 and 2.5.1.0, and reviewing system configurations for potential SSRF vulnerabilities.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-16027 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-16027

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-16027 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-16027

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.