CVE-2026-72861

MEDIUMPre-NVD 5.85.8—
EchelonGraph scoreMEDIUM 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: 0.3%CVSS: 5.8Exploit: None knownExposed services: Not assessed

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

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
5.8MEDIUMmedium confidence
EG Risk
41
EG Risk 41/100CISA 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
Severity58% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
17th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable yes (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 20, 2026

Last Modified

September 24, 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 18× in last 7d / 76× 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 128 total refreshes for this CVE.

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

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 on August 20, 2026, with the most recent update on September 24, 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 0.3% probability of exploitation in the next 30 days (17th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-72861?
CVE-2026-72861 has a CVSS base score of 5.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-72861?
No fix for CVE-2026-72861 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-2026-72861 are linked in the Vendor Advisories panel on this page.

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