CVE-2026-61873

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-07-15. the CNA's CVSS baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this weekElevated
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: Elevated riskExposed: 0

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

Grav before 9.1.8 contains an arbitrary file write vulnerability in the Form plugin's process.save.filename parameter, which is validated against path traversal before Twig processing but never re-validated after rendering. Attackers can submit form data containing path traversal sequences that are processed through Twig templates, allowing them to write arbitrary files including PHP webshells to the web root or other sensitive directories.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
52(Track)
EG Risk 52/100SSVC: 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
Severity81% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

July 15, 2026

Last Modified

July 28, 2026

Advisory Details (2)

Auto-updated Jul 15, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Grav before 9.1.8 Arbitrary File Write via Twig-Processed Filename | Advisories | VulnCheck

https://www.vulncheck.com/advisories/grav-before-arbitrary-file-write-via-twig-processed-filename
github Patch Available🟡 PoC Available

Arbitrary File Write via Twig-Processed Filename -TOCTOU in Form `process.save.filename` · Advisory · getgrav/grav · GitHub

https://github.com/getgrav/grav/security/advisories/GHSA-q532-mvx7-42qg

Vendor Advisories for CVE-2026-61873(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 20× in last 7d / 108× 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 154 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-61873?
CVE-2026-61873 is a high vulnerability published on July 15, 2026. Grav before 9.1.8 contains an arbitrary file write vulnerability in the Form plugin's process.save.filename parameter, which is validated against path traversal before Twig processing but never re-validated after rendering. Attackers can submit form data containing path traversal sequences that are…
When was CVE-2026-61873 disclosed?
CVE-2026-61873 was first published in the National Vulnerability Database on July 15, 2026, with the most recent update on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-61873 actively exploited?
CVE-2026-61873 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 62.0% of all scored CVEs.
What is the CVSS score of CVE-2026-61873?
CVE-2026-61873 has a CVSS v4.0 base score of 8.1 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-61873?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-61873, 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.

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