CVE-2026-16027

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory published 2026-08-07. A secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.4Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

Server-Side request forgery (SSRF) vulnerability in Revenue Administration Türkiye's E-Signature allows Server Side Request Forgery.

This issue affects Türkiye's E-Signature: from 2.4.4.0 before 2.5.1.0.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
13th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 7, 2026

Last Modified

August 26, 2026

Advisory Details (1)

Auto-updated Aug 7, 2026
No patch confirmed yet.
generic

T.C. Siber Güvenlik Başkanlığı

https://siberguvenlik.gov.tr/guvenlik-bildirimleri/detay/tr-26-0772

Vendor Advisories for CVE-2026-16027(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 15× in last 7d / 64× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 149 total refreshes for this CVE.

  1. 2026-10-05 08:17 UTCEG score recompute
  2. 2026-10-05 08:17 UTCGHSA enrichment
  3. 2026-10-04 23:21 UTCEPSS rescore
  4. 2026-10-04 05:45 UTCEG score recompute
  5. 2026-10-04 05:45 UTCGHSA enrichment
  6. 2026-10-03 14:25 UTCEPSS rescore
  7. 2026-10-02 09:34 UTCEG score recompute
  8. 2026-10-02 09:34 UTCGHSA enrichment
  9. 2026-10-01 19:49 UTCEPSS rescore
  10. 2026-09-30 22:57 UTCEG score recompute
  11. 2026-09-30 22:57 UTCGHSA enrichment
  12. 2026-09-30 15:02 UTCEPSS rescore
  13. 2026-09-29 15:20 UTCEPSS rescore
  14. 2026-09-29 05:48 UTCEG score recompute
  15. 2026-09-29 05:48 UTCGHSA enrichment
  16. 2026-09-28 13:51 UTCEPSS rescore
  17. 2026-09-27 17:11 UTCEG score recompute
  18. 2026-09-27 17:11 UTCGHSA enrichment
  19. 2026-09-27 13:47 UTCEPSS rescore
  20. 2026-09-26 15:58 UTCEPSS rescore
  21. 2026-09-25 04:17 UTCEG score recompute
  22. 2026-09-25 04:17 UTCGHSA enrichment
  23. 2026-09-23 15:53 UTCEG score recompute
  24. 2026-09-23 15:53 UTCGHSA enrichment
  25. 2026-09-22 14:08 UTCEG score recompute
Show 75 more
  1. 2026-09-22 14:08 UTCGHSA enrichment
  2. 2026-09-21 12:19 UTCEG score recompute
  3. 2026-09-21 12:19 UTCGHSA enrichment
  4. 2026-09-20 05:48 UTCEG score recompute
  5. 2026-09-20 05:48 UTCGHSA enrichment
  6. 2026-09-19 04:11 UTCEG score recompute
  7. 2026-09-19 04:11 UTCGHSA enrichment
  8. 2026-09-18 19:27 UTCEPSS rescore
  9. 2026-09-18 02:33 UTCEG score recompute
  10. 2026-09-18 02:33 UTCGHSA enrichment
  11. 2026-09-17 00:55 UTCEG score recompute
  12. 2026-09-17 00:55 UTCGHSA enrichment
  13. 2026-09-16 14:07 UTCEPSS rescore
  14. 2026-09-16 05:14 UTCEPSS rescore
  15. 2026-09-15 16:49 UTCEG score recompute
  16. 2026-09-15 16:49 UTCGHSA enrichment
  17. 2026-09-14 15:11 UTCEG score recompute
  18. 2026-09-14 15:11 UTCGHSA enrichment
  19. 2026-09-13 16:46 UTCEPSS rescore
  20. 2026-09-13 13:33 UTCEG score recompute
  21. 2026-09-13 13:33 UTCGHSA enrichment
  22. 2026-09-12 15:00 UTCEPSS rescore
  23. 2026-09-12 11:55 UTCEG score recompute
  24. 2026-09-12 11:55 UTCGHSA enrichment
  25. 2026-09-11 14:52 UTCEPSS rescore
  26. 2026-09-11 09:36 UTCEPSS rescore
  27. 2026-09-11 09:17 UTCEG score recompute
  28. 2026-09-11 09:17 UTCGHSA enrichment
  29. 2026-09-10 09:34 UTCEPSS rescore
  30. 2026-09-10 07:39 UTCGHSA enrichment
  31. 2026-09-09 06:01 UTCEG score recompute
  32. 2026-09-09 06:01 UTCGHSA enrichment
  33. 2026-09-08 22:00 UTCEPSS rescore
  34. 2026-09-07 17:46 UTCEG score recompute
  35. 2026-09-07 17:46 UTCGHSA enrichment
  36. 2026-09-07 16:01 UTCEPSS rescore
  37. 2026-09-06 13:47 UTCEPSS rescore
  38. 2026-09-06 12:30 UTCEG score recompute
  39. 2026-09-06 12:30 UTCGHSA enrichment
  40. 2026-09-05 10:52 UTCEG score recompute
  41. 2026-09-05 10:52 UTCGHSA enrichment
  42. 2026-09-04 09:07 UTCEG score recompute
  43. 2026-09-04 09:07 UTCGHSA enrichment
  44. 2026-09-04 05:06 UTCEPSS rescore
  45. 2026-09-03 06:08 UTCEG score recompute
  46. 2026-09-03 06:08 UTCGHSA enrichment
  47. 2026-09-02 14:11 UTCEPSS rescore
  48. 2026-09-02 00:48 UTCEG score recompute
  49. 2026-09-02 00:47 UTCGHSA enrichment
  50. 2026-09-01 13:53 UTCEPSS rescore
  51. 2026-09-01 04:39 UTCEPSS rescore
  52. 2026-08-31 22:30 UTCEG score recompute
  53. 2026-08-31 22:30 UTCGHSA enrichment
  54. 2026-08-30 19:17 UTCEPSS rescore
  55. 2026-08-30 12:10 UTCEG score recompute
  56. 2026-08-30 12:10 UTCGHSA enrichment
  57. 2026-08-30 01:22 UTCEPSS rescore
  58. 2026-08-29 10:26 UTCEG score recompute
  59. 2026-08-29 10:25 UTCGHSA enrichment
  60. 2026-08-28 21:41 UTCEPSS rescore
  61. 2026-08-27 19:49 UTCEG score recompute
  62. 2026-08-27 19:49 UTCGHSA enrichment
  63. 2026-08-27 14:25 UTCEPSS rescore
  64. 2026-08-26 17:28 UTCEG score recompute
  65. 2026-08-26 17:28 UTCGHSA enrichment
  66. 2026-08-26 14:46 UTCEPSS rescore
  67. 2026-08-25 20:42 UTCEG score recompute
  68. 2026-08-25 20:42 UTCGHSA enrichment
  69. 2026-08-25 13:48 UTCEPSS rescore
  70. 2026-08-24 18:48 UTCEG score recompute
  71. 2026-08-24 18:48 UTCGHSA enrichment
  72. 2026-08-23 17:10 UTCEG score recompute
  73. 2026-08-23 17:10 UTCGHSA enrichment
  74. 2026-08-23 00:19 UTCEPSS rescore
  75. 2026-08-22 15:33 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-16027?
CVE-2026-16027 is a medium vulnerability published on August 7, 2026. Server-Side request forgery (SSRF) vulnerability in Revenue Administration Türkiye's E-Signature allows Server Side Request Forgery. This issue affects Türkiye's E-Signature: from 2.4.4.0 before 2.5.1.0.
When was CVE-2026-16027 disclosed?
CVE-2026-16027 was first published on August 7, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16027 actively exploited?
CVE-2026-16027 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (13th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-16027?
CVE-2026-16027 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-16027?
No fix for CVE-2026-16027 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-16027 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-16027

Explore →

Is Your Infrastructure Affected by CVE-2026-16027?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs