CVE-2026-27760

HIGHPre-NVD 8.18.2▲
EchelonGraph scoreHIGH confidence

Score elevated to 8.2 because EPSS predicts 35% probability of exploitation within the next 30 days (top 1.7% of all CVEs). a secondary CVSS source baseline 8.1 retained for reference (NVD's own analysis pending). Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, secondary
Weaponized
8.2EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • Public exploit code is available (Metasploit, ssvc poc, epss top5pct, public exploit)
CISA-KEV: Not listedEPSS PROB: 35%CVSS: 8.1Exploit: Metasploit · ssvc poc · epss top5pct · public exploitExposed: 0

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

OpenCATS prior to commit 3002a29 contains a PHP code injection vulnerability in the installer AJAX endpoint that allows unauthenticated attackers to execute arbitrary code by injecting PHP statements into the databaseConnectivity action parameter. Attackers can break out of the define() string context in config.php using a single quote and statement separator to inject malicious PHP code that persists and executes on every subsequent page load when the installation wizard remains incomplete.

CVSS v3
8.1
EG Score
8.2(high)
EG Risk
63(Track*)
EG Risk 63/100SSVC: 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
Severity82% × 45%
Exploitation65% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
35%
EPSS %ILE
98%
KEV
Not listed

Published

April 28, 2026

Last Modified

July 14, 2026

Advisory Details (5)

Auto-updated May 4, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

security: restrict AJAX during upgrade and escape installer config writes by anonymoususer72041 · Pull Request #706 · opencats/OpenCATS · GitHub

https://github.com/opencats/OpenCATS/pull/706
generic

security: restrict AJAX during upgrade and escape installer config wr… · opencats/OpenCATS@3002a29 · GitHub

https://github.com/opencats/OpenCATS/commit/3002a29f4c3cada1aa2c4f3d4ae4e189906606b6
generic

OpenCATS/modules/install/ajax/ui.php at 46e47273965130c042dd213ebfd0dde2bbe5046c · opencats/OpenCATS · GitHub

https://github.com/opencats/OpenCATS/blob/46e4727/modules/install/ajax/ui.php#L130
generic

OpenCATS/lib/CATSUtility.php at 46e47273965130c042dd213ebfd0dde2bbe5046c · opencats/OpenCATS · GitHub

https://github.com/opencats/OpenCATS/blob/46e4727/lib/CATSUtility.php#L142-L172
generic🔴 Active Exploitation

Unauthenticated RCE in OpenCATS via Installer Config Injection - Chocapikk's Cybersecurity Blog

https://chocapikk.com/posts/2026/opencats-installer-rce/

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 51× 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 201 total refreshes for this CVE.

  1. 2026-08-30 19:17 UTCEPSS rescore
  2. 2026-08-30 01:22 UTCEPSS rescore
  3. 2026-08-28 21:41 UTCEPSS rescore
  4. 2026-08-26 14:46 UTCEPSS rescore
  5. 2026-08-25 13:48 UTCEPSS rescore
  6. 2026-08-23 00:19 UTCEPSS rescore
  7. 2026-08-21 23:49 UTCEPSS rescore
  8. 2026-08-20 22:55 UTCEPSS rescore
  9. 2026-08-19 17:03 UTCEPSS rescore
  10. 2026-08-18 13:48 UTCEPSS rescore
  11. 2026-08-17 13:58 UTCEG score recompute
  12. 2026-08-17 13:58 UTCGHSA enrichment
  13. 2026-08-16 14:56 UTCEPSS rescore
  14. 2026-08-16 05:33 UTCEG score recompute
  15. 2026-08-16 05:33 UTCGHSA enrichment
  16. 2026-08-16 02:14 UTCEPSS rescore
  17. 2026-08-15 02:06 UTCEG score recompute
  18. 2026-08-15 02:06 UTCGHSA enrichment
  19. 2026-08-15 01:30 UTCEPSS rescore
  20. 2026-08-14 15:03 UTCGHSA enrichment
  21. 2026-08-14 03:59 UTCEG score recompute
  22. 2026-08-14 03:59 UTCGHSA enrichment
  23. 2026-08-13 22:00 UTCEPSS rescore
  24. 2026-08-13 04:43 UTCGHSA enrichment
  25. 2026-08-12 17:38 UTCEG score recompute
Show 75 more
  1. 2026-08-12 17:38 UTCGHSA enrichment
  2. 2026-08-12 13:50 UTCEPSS rescore
  3. 2026-08-11 16:31 UTCEG score recompute
  4. 2026-08-11 16:31 UTCGHSA enrichment
  5. 2026-08-11 13:42 UTCEPSS rescore
  6. 2026-08-11 01:57 UTCGHSA enrichment
  7. 2026-08-10 12:46 UTCGHSA enrichment
  8. 2026-08-10 01:16 UTCGHSA enrichment
  9. 2026-08-09 14:12 UTCGHSA enrichment
  10. 2026-08-09 03:08 UTCGHSA enrichment
  11. 2026-08-08 10:29 UTCGHSA enrichment
  12. 2026-08-07 23:25 UTCEG score recompute
  13. 2026-08-07 23:25 UTCGHSA enrichment
  14. 2026-08-07 12:21 UTCGHSA enrichment
  15. 2026-08-06 21:17 UTCEG score recompute
  16. 2026-08-06 21:17 UTCGHSA enrichment
  17. 2026-08-06 13:46 UTCEPSS rescore
  18. 2026-08-06 10:13 UTCGHSA enrichment
  19. 2026-08-05 22:46 UTCEG score recompute▲ 0.10
  20. 2026-08-05 22:46 UTCGHSA enrichment
  21. 2026-08-05 19:17 UTCEPSS rescore
  22. 2026-08-04 15:10 UTCEPSS rescore
  23. 2026-08-03 20:49 UTCEG score recompute
  24. 2026-08-03 20:49 UTCGHSA enrichment
  25. 2026-08-03 10:36 UTCEPSS rescore
  26. 2026-08-02 17:05 UTCGHSA enrichment
  27. 2026-08-02 05:58 UTCEG score recompute
  28. 2026-08-02 05:58 UTCGHSA enrichment
  29. 2026-08-02 02:26 UTCEPSS rescore
  30. 2026-08-01 04:16 UTCEPSS rescore
  31. 2026-07-30 16:27 UTCEPSS rescore
  32. 2026-07-30 01:30 UTCEPSS rescore
  33. 2026-07-28 15:36 UTCEPSS rescore
  34. 2026-07-26 14:54 UTCEPSS rescore
  35. 2026-07-26 14:54 UTCEPSS rescore
  36. 2026-07-25 14:18 UTCEPSS rescore
  37. 2026-07-25 14:17 UTCEPSS rescore
  38. 2026-07-24 14:17 UTCEPSS rescore
  39. 2026-07-23 14:18 UTCEPSS rescore
  40. 2026-07-23 14:18 UTCEPSS rescore
  41. 2026-07-23 03:08 UTCEG score recompute
  42. 2026-07-22 14:08 UTCEPSS rescore
  43. 2026-07-22 14:08 UTCEPSS rescore
  44. 2026-07-21 15:24 UTCEPSS rescore
  45. 2026-07-21 15:24 UTCEPSS rescore
  46. 2026-07-20 17:08 UTCEPSS rescore
  47. 2026-07-20 17:08 UTCEPSS rescore
  48. 2026-07-20 10:02 UTCOSV refresh
  49. 2026-07-19 02:29 UTCEPSS rescore
  50. 2026-07-18 10:04 UTCEPSS rescore
  51. 2026-07-18 10:04 UTCEPSS rescore
  52. 2026-07-16 17:03 UTCEPSS rescore
  53. 2026-07-16 17:03 UTCEPSS rescore
  54. 2026-07-15 16:57 UTCEPSS rescore
  55. 2026-07-15 16:57 UTCEPSS rescore
  56. 2026-07-15 02:00 UTCEPSS rescore
  57. 2026-07-15 02:00 UTCEPSS rescore
  58. 2026-07-13 22:30 UTCEPSS rescore
  59. 2026-07-12 05:46 UTCEPSS rescore
  60. 2026-07-11 08:27 UTCEPSS rescore
  61. 2026-07-09 19:10 UTCEPSS rescore
  62. 2026-07-08 15:15 UTCEPSS rescore
  63. 2026-07-07 13:46 UTCEPSS rescore
  64. 2026-07-06 16:27 UTCEPSS rescore
  65. 2026-07-06 16:27 UTCEPSS rescore
  66. 2026-07-06 02:23 UTCEPSS rescore
  67. 2026-07-06 02:23 UTCEPSS rescore
  68. 2026-07-05 02:30 UTCEPSS rescore
  69. 2026-07-01 15:06 UTCEPSS rescore
  70. 2026-07-01 15:06 UTCEPSS rescore
  71. 2026-06-30 23:22 UTCEPSS rescore
  72. 2026-06-30 23:22 UTCEPSS rescore
  73. 2026-06-28 14:07 UTCEPSS rescore
  74. 2026-06-28 14:07 UTCEPSS rescore
  75. 2026-06-28 04:56 UTCEPSS rescore

Publicly available exploits

(2 references)

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/opencats_installer_rce✓ verified
    First seen Apr 28, 2026

    OpenCATS Installer PHP Code Injection

    Open source ↗
  • Nucleihttp/cves/2026/CVE-2026-27760.yaml
    First seen Jan 1, 2026

    OpenCATS - Command Injection

    Open source ↗

Frequently asked(5)

What is CVE-2026-27760?
CVE-2026-27760 is a high vulnerability published on April 28, 2026. OpenCATS prior to commit 3002a29 contains a PHP code injection vulnerability in the installer AJAX endpoint that allows unauthenticated attackers to execute arbitrary code by injecting PHP statements into the databaseConnectivity action parameter. Attackers can break out of the define() string…
When was CVE-2026-27760 disclosed?
CVE-2026-27760 was first published in the National Vulnerability Database on April 28, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-27760 actively exploited?
CVE-2026-27760 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 35% probability of exploitation in the next 30 days, which ranks it in the top 1.7% of all scored CVEs.
What is the CVSS score of CVE-2026-27760?
CVE-2026-27760 has a CVSS v3 base score of 8.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.2.
How do I remediate CVE-2026-27760?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-27760, 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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