CVE-2026-27760

HIGHPre-NVD 8.18.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 8.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-28. A secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this weekWeaponized
8.1EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Public exploit code is available (Metasploit)
CISA-KEV: Not listedEPSS PROB: 3.4%CVSS: 8.1Exploit: MetasploitExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

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
8.1HIGHmedium confidence
EG Risk
62
EG Risk 62/100

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 (value × EchelonGraph’s weight)
Severity81% × 45%
The EG Score, 8.1 of 10.
Exploitation65% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 2 (Weaponized): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
3.4%
EPSS %ILE
88th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

April 28, 2026

Last Modified

July 14, 2026

Advisory Details (5)

Auto-updated May 4, 2026
Fix referenced — no release confirmed yet.
Web page

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
Web page

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

https://github.com/opencats/OpenCATS/commit/3002a29f4c3cada1aa2c4f3d4ae4e189906606b6
Web page

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

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

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

https://github.com/opencats/OpenCATS/blob/46e4727/lib/CATSUtility.php#L142-L172
Web page

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 12× in last 7d / 26× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 97 of 238 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 100 are merged into the row they repeat. The 141 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-16 16:41 UTCEPSS rescoreEPSS 3.4% · 88th percentile
  2. 2026-10-15 16:31 UTCEPSS rescoreEPSS 3.4% · 88th percentile
  3. 2026-10-14 16:32 UTCEPSS rescoreEPSS 3.4% · 88th percentile
  4. 2026-10-13 16:34 UTCEPSS rescoreEPSS 3.4% · 88th percentile
  5. 2026-10-13 15:54 UTCOSV refresh
  6. 2026-10-12 16:33 UTCEPSS rescoreEPSS 3.4% · 88th percentile
  7. 2026-10-12 16:17 UTCEG score recompute
  8. 2026-10-11 19:59 UTCEG score recompute
  9. 2026-10-11 17:13 UTCEG score recompute
  10. 2026-10-11 14:44 UTCEG score recompute▼ 0.10
  11. 2026-10-11 13:48 UTCEPSS rescoreEPSS 3.4% · 88th percentile
  12. 2026-10-10 20:00 UTCEPSS rescoreEPSS 3.4% · 88th percentile
  13. 2026-10-09 20:07 UTCEPSS rescoreEPSS 3.4% · 88th percentile
  14. 2026-10-08 17:11 UTCEPSS rescoreEPSS 3.4% · 88th percentile
  15. 2026-10-07 23:47 UTCEPSS rescoreEPSS 3.4% · 88th percentile
  16. 2026-10-06 15:17 UTCEPSS rescoreEPSS 3.4% · 88th percentile
  17. 2026-10-05 17:42 UTCEPSS rescoreEPSS 3.4% · 88th percentile
  18. 2026-10-04 23:21 UTCEPSS rescoreEPSS 3.4% · 88th percentile
  19. 2026-10-03 14:25 UTCEPSS rescoreEPSS 3.4% · 88th percentile
  20. 2026-10-01 19:49 UTCEPSS rescoreEPSS 3.4% · 88th percentile
  21. 2026-09-30 15:03 UTCEPSS rescoreEPSS 3.4% · 88th percentile
  22. 2026-09-26 15:58 UTCEPSS rescoreEPSS 3.4% · 88th percentile
  23. 2026-09-26 00:26 UTCEPSS rescoreEPSS 3.4% · 88th percentile
  24. 2026-09-23 06:45 UTCOSV refresh
  25. 2026-09-18 19:27 UTCEPSS rescoreEPSS 35% · 98th percentile
Show 72 more
  1. 2026-09-17 19:30 UTCEPSS rescoreEPSS 35% · 98th percentile
  2. 2026-09-16 14:08 UTCEPSS rescoreEPSS 35% · 98th percentile
  3. 2026-09-16 05:15 UTCEPSS rescoreEPSS 35% · 98th percentile
  4. 2026-09-13 16:47 UTCEPSS rescoreEPSS 35% · 98th percentile
  5. 2026-09-12 15:01 UTCEPSS rescoreEPSS 35% · 98th percentile
  6. 2026-09-11 14:52 UTCEPSS rescoreEPSS 35% · 98th percentile
  7. 2026-09-10 09:34 UTCEPSS rescoreEPSS 35% · 98th percentile
  8. 2026-09-08 22:00 UTCEPSS rescoreEPSS 35% · 98th percentile
  9. 2026-09-06 13:47 UTCEPSS rescoreEPSS 35% · 98th percentile
  10. 2026-09-04 05:06 UTCEPSS rescoreEPSS 35% · 98th percentile
  11. 2026-09-04 01:29 UTCOSV refresh
  12. 2026-09-02 14:11 UTCEPSS rescoreEPSS 35% · 98th percentile
  13. 2026-09-01 13:53 UTCEPSS rescoreEPSS 35% · 98th percentile
  14. 2026-08-30 19:17 UTCEPSS rescoreEPSS 35% · 98th percentile
  15. 2026-08-30 01:22 UTCEPSS rescoreEPSS 35% · 98th percentile
  16. 2026-08-28 21:41 UTCEPSS rescoreEPSS 35% · 98th percentile
  17. 2026-08-26 14:46 UTCEPSS rescoreEPSS 35% · 98th percentile
  18. 2026-08-25 13:48 UTCEPSS rescoreEPSS 35% · 98th percentile
  19. 2026-08-23 00:19 UTCEPSS rescoreEPSS 35% · 98th percentile
  20. 2026-08-21 23:49 UTCEPSS rescoreEPSS 35% · 98th percentile
  21. 2026-08-20 22:55 UTCEPSS rescoreEPSS 35% · 98th percentile
  22. 2026-08-19 17:03 UTCEPSS rescoreEPSS 35% · 98th percentile
  23. 2026-08-18 13:48 UTCEPSS rescoreEPSS 35% · 98th percentile
  24. 2026-08-17 13:58 UTCEG score recompute
  25. 2026-08-17 13:58 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  26. 2026-08-16 14:56 UTCEPSS rescoreEPSS 35% · 98th percentile
  27. 2026-08-16 05:33 UTCEG score recompute
  28. 2026-08-16 05:33 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  29. 2026-08-16 02:14 UTCEPSS rescoreEPSS 35% · 98th percentile
  30. 2026-08-15 02:06 UTCEG score recompute
  31. 2026-08-15 02:06 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  32. 2026-08-15 01:30 UTCEPSS rescoreEPSS 35% · 98th percentile
  33. 2026-08-14 15:03 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  34. 2026-08-14 03:59 UTCEG score recompute
  35. 2026-08-14 03:59 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  36. 2026-08-13 22:00 UTCEPSS rescoreEPSS 35% · 98th percentile
  37. 2026-08-13 04:43 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  38. 2026-08-12 17:38 UTCEG score recompute
  39. 2026-08-12 17:38 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  40. 2026-08-12 13:50 UTCEPSS rescoreEPSS 35% · 98th percentile
  41. 2026-08-11 16:31 UTCEG score recompute
  42. 2026-08-11 16:31 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  43. 2026-08-11 13:42 UTCEPSS rescoreEPSS 35% · 98th percentile
  44. 2026-08-11 01:57 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  45. 2026-08-10 12:46 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  46. 2026-08-10 01:16 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  47. 2026-08-09 14:12 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  48. 2026-08-09 03:08 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  49. 2026-08-08 10:29 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  50. 2026-08-07 23:25 UTCEG score recompute
  51. 2026-08-07 23:25 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  52. 2026-08-07 12:21 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  53. 2026-08-06 21:17 UTCEG score recompute
  54. 2026-08-06 21:17 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  55. 2026-08-06 13:46 UTCEPSS rescoreEPSS 35% · 98th percentile
  56. 2026-08-06 10:13 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  57. 2026-08-05 22:46 UTCEG score recompute▲ 0.10
  58. 2026-08-05 22:46 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  59. 2026-08-05 19:17 UTCEPSS rescoreEPSS 35% · 98th percentile
  60. 2026-08-04 15:10 UTCEPSS rescoreEPSS 24% · 97th percentile
  61. 2026-08-03 20:49 UTCEG score recompute
  62. 2026-08-03 20:49 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  63. 2026-08-03 10:36 UTCEPSS rescoreEPSS 24% · 97th percentile
  64. 2026-08-02 17:05 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  65. 2026-08-02 05:58 UTCEG score recompute
  66. 2026-08-02 05:58 UTCGHSA enrichmentGHSA-h957-4jfh-qc3p · GitHub severity CRITICAL · GitHub CVSS 8.1
  67. 2026-08-02 02:26 UTCEPSS rescoreEPSS 24% · 97th percentile
  68. 2026-08-01 04:16 UTCEPSS rescoreEPSS 24% · 97th percentile
  69. 2026-07-30 16:27 UTCEPSS rescoreEPSS 24% · 97th percentile
  70. 2026-07-30 01:30 UTCEPSS rescoreEPSS 24% · 97th percentile
  71. 2026-07-28 15:36 UTCEPSS rescoreEPSS 24% · 97th percentile
  72. 2026-07-26 14:54 UTCEPSS rescoreEPSS 24% · 97th percentile

Publicly available exploits

(2 references)

Public exploit code is referenced for this CVE (1 Metasploit module), as is 1 Nuclei detection template. A detection template checks whether a system is affected; it is not necessarily exploit code. No release with the fix is confirmed, so defenders should restrict or isolate affected systems accordingly until one is applied.

  • Metasploitexploit/multi/http/opencats_installer_rce✓ verified
    Published Aug 4, 2026

    OpenCATS Installer PHP Code Injection

    Open source ↗
  • Nucleihttp/cves/2026/CVE-2026-27760.yaml
    Published Jun 17, 2026

    OpenCATS - Command Injection

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-27760?
CVE-2026-27760 is a high-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-27760 published?
The CVE record for CVE-2026-27760 was published on April 28, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 14, 2026; the record at its source may have been updated since.
Is CVE-2026-27760 actively exploited?
CVE-2026-27760 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model places it in Tier 2 (Weaponized), which is not evidence of exploitation: a Metasploit module exists for it. EchelonGraph does not test whether exploit code works. FIRST EPSS estimates a 3.4% probability of exploitation in the next 30 days (88th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-27760?
CVE-2026-27760 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-27760?
A fix for CVE-2026-27760 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Dependency Blast Radius

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