CVE-2026-72861

MEDIUMPre-NVD 5.85.8—
EchelonGraph scoreHIGH confidence

Score 5.8 from GitHub Security Advisory published 2026-08-20. a secondary CVSS source baseline 5.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.8Exploit: None knownExposed: 0

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

The github-issue-bot templates in appwrite/templates verify the GitHub webhook signature with an inverted condition. verifyWebhook in node/github-issue-bot/src/github.js and in node-typescript/github-issue-bot/src/github.ts returns "typeof signature !== 'string' || (await verify(...))", so when the X-Hub-Signature-256 header is absent the first operand is true, the logical OR short-circuits, and the function reports success without performing any HMAC verification. main.js rejects a request only when verifyWebhook returns false, so an unauthenticated request carrying no signature passes the check. Processing then continues to postComment, which takes the repository and issue objects directly from the request body, letting the caller direct the deployed function to post a comment on a repository and issue of their choosing using the configured GITHUB_TOKEN, with the issue author login from the body interpolated into the comment text.

CVSS v3
5.8
EG Score
5.8(high)
EG Risk
41(Track)
EG Risk 41/100SSVC: Track

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
Severity58% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

August 20, 2026

Last Modified

August 21, 2026

Advisory Details (6)

Auto-updated Aug 20, 2026
No patch confirmed yet.
generic

Appwrite Templates github-issue-bot Skips Webhook Signature Verification When the X-Hub-Signature-256 Header Is Absent | Advisories | VulnCheck

https://www.vulncheck.com/advisories/appwrite-templates-github-issue-bot-skips-webhook-signature-verification-when-the-x-hub-signature-256-header-is-absent
generic

GitHub - appwrite/templates: Templates for Appwrite Functions ⚡️🌩️ · GitHub

https://github.com/appwrite/templates
generic

templates/node/github-issue-bot/src/main.js at 1.1.2 · appwrite/templates · GitHub

https://github.com/appwrite/templates/blob/1.1.2/node/github-issue-bot/src/main.js
generic

templates/node-typescript/github-issue-bot/src/github.ts at 1.1.2 · appwrite/templates · GitHub

https://github.com/appwrite/templates/blob/1.1.2/node-typescript/github-issue-bot/src/github.ts
generic

templates/node/github-issue-bot/src/github.js at 1.1.2 · appwrite/templates · GitHub

https://github.com/appwrite/templates/blob/1.1.2/node/github-issue-bot/src/github.js
generic

Authentication Bypass in GitHub Webhook Verification via Missing X-Hub-Signature-256 Header · Issue #350 · appwrite/templates · GitHub

https://github.com/appwrite/templates/issues/350

Vendor Advisories for CVE-2026-72861(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 17× in last 7d / 86× 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.

  1. 2026-09-19 20:24 UTCEG score recompute
  2. 2026-09-19 20:24 UTCGHSA enrichment
  3. 2026-09-18 21:38 UTCEG score recompute
  4. 2026-09-18 21:38 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-17 21:19 UTCEG score recompute
  7. 2026-09-17 21:19 UTCGHSA enrichment
  8. 2026-09-16 19:45 UTCEG score recompute
  9. 2026-09-16 19:44 UTCGHSA enrichment
  10. 2026-09-16 14:08 UTCEPSS rescore
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 18:47 UTCEG score recompute
  13. 2026-09-15 18:47 UTCGHSA enrichment
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-14 19:47 UTCGHSA enrichment
  16. 2026-09-13 21:01 UTCEG score recompute
  17. 2026-09-13 21:01 UTCGHSA enrichment
  18. 2026-09-12 22:15 UTCEG score recompute
  19. 2026-09-12 22:15 UTCGHSA enrichment
  20. 2026-09-12 15:02 UTCEPSS rescore
  21. 2026-09-11 23:28 UTCEG score recompute
  22. 2026-09-11 23:28 UTCGHSA enrichment
  23. 2026-09-11 14:53 UTCEPSS rescore
  24. 2026-09-11 00:18 UTCEG score recompute
  25. 2026-09-11 00:18 UTCGHSA enrichment
Show 64 more
  1. 2026-09-10 09:35 UTCEPSS rescore
  2. 2026-09-10 00:48 UTCGHSA enrichment
  3. 2026-09-09 01:54 UTCEG score recompute
  4. 2026-09-09 01:54 UTCGHSA enrichment
  5. 2026-09-08 22:01 UTCEPSS rescore
  6. 2026-09-08 01:29 UTCEG score recompute
  7. 2026-09-08 01:29 UTCGHSA enrichment
  8. 2026-09-07 02:43 UTCEG score recompute
  9. 2026-09-07 02:42 UTCGHSA enrichment
  10. 2026-09-06 13:48 UTCEPSS rescore
  11. 2026-09-06 03:18 UTCEG score recompute
  12. 2026-09-06 03:18 UTCGHSA enrichment
  13. 2026-09-05 04:32 UTCEG score recompute
  14. 2026-09-05 04:32 UTCGHSA enrichment
  15. 2026-09-04 05:46 UTCEG score recompute
  16. 2026-09-04 05:46 UTCGHSA enrichment
  17. 2026-09-04 05:07 UTCEPSS rescore
  18. 2026-09-03 06:57 UTCEG score recompute
  19. 2026-09-03 06:57 UTCGHSA enrichment
  20. 2026-09-02 14:12 UTCEPSS rescore
  21. 2026-09-02 08:06 UTCEG score recompute
  22. 2026-09-02 08:06 UTCGHSA enrichment
  23. 2026-09-01 13:54 UTCEPSS rescore
  24. 2026-09-01 09:20 UTCEG score recompute
  25. 2026-09-01 09:20 UTCGHSA enrichment
  26. 2026-09-01 04:40 UTCEPSS rescore
  27. 2026-09-01 04:40 UTCEPSS rescore
  28. 2026-08-31 10:32 UTCEG score recompute
  29. 2026-08-31 10:32 UTCGHSA enrichment
  30. 2026-08-30 19:18 UTCEPSS rescore
  31. 2026-08-30 19:17 UTCEPSS rescore
  32. 2026-08-30 11:40 UTCEG score recompute
  33. 2026-08-30 11:40 UTCGHSA enrichment
  34. 2026-08-30 01:22 UTCEPSS rescore
  35. 2026-08-29 12:54 UTCEG score recompute
  36. 2026-08-29 12:53 UTCGHSA enrichment
  37. 2026-08-28 21:42 UTCEPSS rescore
  38. 2026-08-28 13:59 UTCGHSA enrichment
  39. 2026-08-27 15:10 UTCEG score recompute
  40. 2026-08-27 15:10 UTCGHSA enrichment
  41. 2026-08-27 14:25 UTCEPSS rescore
  42. 2026-08-26 16:24 UTCEG score recompute
  43. 2026-08-26 16:24 UTCGHSA enrichment
  44. 2026-08-26 14:47 UTCEPSS rescore
  45. 2026-08-25 17:31 UTCEG score recompute
  46. 2026-08-25 17:31 UTCGHSA enrichment
  47. 2026-08-25 13:49 UTCEPSS rescore
  48. 2026-08-24 18:46 UTCEG score recompute
  49. 2026-08-24 18:46 UTCGHSA enrichment
  50. 2026-08-23 20:00 UTCEG score recompute
  51. 2026-08-23 20:00 UTCGHSA enrichment
  52. 2026-08-23 00:19 UTCEPSS rescore
  53. 2026-08-22 21:14 UTCEG score recompute
  54. 2026-08-22 21:13 UTCGHSA enrichment
  55. 2026-08-21 23:49 UTCEPSS rescore
  56. 2026-08-21 22:26 UTCEG score recompute
  57. 2026-08-21 22:26 UTCGHSA enrichment
  58. 2026-08-21 21:52 UTCEG score recompute
  59. 2026-08-21 21:52 UTCGHSA enrichment
  60. 2026-08-21 19:06 UTCEG score recompute
  61. 2026-08-21 19:06 UTCGHSA enrichment
  62. 2026-08-20 20:20 UTCEG score recompute
  63. 2026-08-20 19:52 UTCEG score recompute
  64. 2026-08-20 19:51 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-72861?
CVE-2026-72861 is a medium vulnerability published on August 20, 2026. The github-issue-bot templates in appwrite/templates verify the GitHub webhook signature with an inverted condition. verifyWebhook in node/github-issue-bot/src/github.js and in node-typescript/github-issue-bot/src/github.ts returns "typeof signature !== 'string' || (await verify(...))", so when the…
When was CVE-2026-72861 disclosed?
CVE-2026-72861 was first published in the National Vulnerability Database on August 20, 2026, with the most recent update on August 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-72861 actively exploited?
CVE-2026-72861 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 89.9% of all scored CVEs.
What is the CVSS score of CVE-2026-72861?
CVE-2026-72861 has a CVSS v3 base score of 5.8 (NVD).
How do I remediate CVE-2026-72861?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-72861, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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