CVE-2026-77647

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-21. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekWeaponized
9.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • Public exploit code is available (Metasploit, public exploit)
CISA-KEV: Not listedEPSS PROB: 2.3%CVSS: 9.8Exploit: Metasploit · public exploitExposed services: Not assessed

A fix is available — apply it.

SPIP before 4.4.20 allows unauthenticated remote attackers to execute arbitrary code, as exploited in the wild in August 2026. This is related to incorrect identification of

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
85
EG Risk 85/100CISA 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
Severity98% × 45%
Exploitation65% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
2.3%
EPSS %ILE
82nd
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (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 8, 2026

Advisory Details (2)

Auto-updated Oct 7, 2026
Patch available.
generic

[SECURITY] [DSA 6448-1] spip security update

https://lists.debian.org/debian-security-announce/2026/msg00359.html
generic

Mise à jour critique de sécurité : sortie de SPIP 4.4.20 - SPIP Blog

https://blog.spip.net/Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-4-20.html

Vendor Advisories for CVE-2026-77647(1)

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

Affected Packages

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
spip4.4.10+dfsg-1 ... 4.4.9+dfsg-1 (21 versions)
  • every version up to 4.4.20+dfsg-0+deb13u1: fixed in 4.4.20+dfsg-0+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
spip4.4.10+dfsg-1 ... 4.4.9+dfsg-1 (15 versions)
  • every version up to 4.4.20+dfsg-1: fixed in 4.4.20+dfsg-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 43× in last 7d / 201× 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 350 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Metasploit module). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Metasploitexploit/multi/http/spip_x_spip_filtre_rce✓ verified
    First seen Aug 20, 2026

    SPIP X-Spip-Filtre Unauthenticated RCE

    Open source ↗

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-77647?
CVE-2026-77647 is a critical vulnerability published on August 20, 2026. SPIP before 4.4.20 allows unauthenticated remote attackers to execute arbitrary code, as exploited in the wild in August 2026. This is related to incorrect identification of <?php blocks, and var_export's mishandling of certain cases such as presence of a '<' character.
When was CVE-2026-77647 disclosed?
CVE-2026-77647 was first published on August 20, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77647 actively exploited?
CVE-2026-77647 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model classifies it as weaponized: a functional public exploit exists. FIRST EPSS estimates a 2.3% probability of exploitation in the next 30 days (82nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-77647?
CVE-2026-77647 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-77647?
A fix for CVE-2026-77647 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-77647 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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