CVE-2026-12209

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-06-15. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0

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

A security vulnerability has been detected in RubyLouvre avalon up to 2.2.10. The impacted element is an unknown function of the file src/filters/index.js of the component Template Filter Handler. Such manipulation leads to improperly controlled modification of object prototype attributes. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS v3
5.3
EG Score
5.3(high)
EPSS
23.3%
KEV
Not listed

Published

June 15, 2026

Last Modified

June 15, 2026

Advisory Details (1)

Auto-updated Jun 15, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

GitHub - OriginSecurityX/avalon-filter-rce · GitHub

https://github.com/OriginSecurityX/avalon-filter-rce

Vendor Advisories for CVE-2026-12209(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 78× 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.

  1. 2026-07-07 00:31 UTCEG score recompute
  2. 2026-07-07 00:31 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-05 22:11 UTCEG score recompute
  6. 2026-07-05 22:11 UTCGHSA enrichment
  7. 2026-07-05 02:30 UTCEPSS rescore
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-04 23:35 UTCEG score recompute
  10. 2026-07-04 23:35 UTCGHSA enrichment
  11. 2026-07-04 06:31 UTCEPSS rescore
  12. 2026-07-04 01:01 UTCEG score recompute
  13. 2026-07-04 01:01 UTCGHSA enrichment
  14. 2026-07-03 02:12 UTCEG score recompute
  15. 2026-07-03 02:12 UTCGHSA enrichment
  16. 2026-07-02 03:37 UTCEG score recompute
  17. 2026-07-02 03:37 UTCGHSA enrichment
  18. 2026-07-01 15:06 UTCEPSS rescore
  19. 2026-07-01 15:06 UTCEPSS rescore
  20. 2026-07-01 05:02 UTCEG score recompute
  21. 2026-07-01 05:02 UTCGHSA enrichment
  22. 2026-06-30 23:22 UTCEPSS rescore
  23. 2026-06-30 06:22 UTCEG score recompute
  24. 2026-06-30 06:22 UTCGHSA enrichment
  25. 2026-06-29 14:06 UTCEPSS rescore
Show 53 more
  1. 2026-06-29 07:46 UTCEG score recompute
  2. 2026-06-29 07:46 UTCGHSA enrichment
  3. 2026-06-28 14:07 UTCEPSS rescore
  4. 2026-06-28 09:07 UTCEG score recompute
  5. 2026-06-28 09:07 UTCGHSA enrichment
  6. 2026-06-28 04:56 UTCEPSS rescore
  7. 2026-06-28 04:56 UTCEPSS rescore
  8. 2026-06-27 10:33 UTCEG score recompute
  9. 2026-06-27 10:33 UTCGHSA enrichment
  10. 2026-06-27 03:08 UTCEPSS rescore
  11. 2026-06-26 11:59 UTCEG score recompute
  12. 2026-06-26 11:59 UTCGHSA enrichment
  13. 2026-06-25 13:49 UTCEPSS rescore
  14. 2026-06-25 11:58 UTCEG score recompute
  15. 2026-06-25 11:58 UTCGHSA enrichment
  16. 2026-06-24 14:05 UTCEPSS rescore
  17. 2026-06-24 13:22 UTCEG score recompute
  18. 2026-06-24 13:22 UTCGHSA enrichment
  19. 2026-06-23 21:32 UTCEPSS rescore
  20. 2026-06-23 14:31 UTCEG score recompute
  21. 2026-06-23 14:30 UTCGHSA enrichment
  22. 2026-06-22 15:41 UTCEG score recompute
  23. 2026-06-22 15:41 UTCGHSA enrichment
  24. 2026-06-22 14:25 UTCEPSS rescore
  25. 2026-06-22 14:25 UTCEPSS rescore
  26. 2026-06-21 17:02 UTCEG score recompute
  27. 2026-06-21 17:01 UTCGHSA enrichment
  28. 2026-06-21 14:56 UTCEPSS rescore
  29. 2026-06-21 14:56 UTCEPSS rescore
  30. 2026-06-21 01:59 UTCEPSS rescore
  31. 2026-06-21 01:59 UTCEPSS rescore
  32. 2026-06-20 18:26 UTCEG score recompute
  33. 2026-06-20 18:25 UTCGHSA enrichment
  34. 2026-06-19 19:47 UTCEG score recompute
  35. 2026-06-19 19:47 UTCGHSA enrichment
  36. 2026-06-19 19:25 UTCEPSS rescore
  37. 2026-06-18 21:12 UTCEG score recompute
  38. 2026-06-18 21:12 UTCGHSA enrichment
  39. 2026-06-18 17:52 UTCEPSS rescore
  40. 2026-06-17 22:35 UTCEG score recompute
  41. 2026-06-17 22:35 UTCGHSA enrichment
  42. 2026-06-17 17:53 UTCEPSS rescore
  43. 2026-06-17 00:01 UTCEG score recompute
  44. 2026-06-17 00:01 UTCGHSA enrichment
  45. 2026-06-16 17:52 UTCEPSS rescore
  46. 2026-06-16 01:27 UTCEG score recompute
  47. 2026-06-16 01:27 UTCGHSA enrichment
  48. 2026-06-15 21:45 UTCNVD updateCVSS v4 → 5.5
  49. 2026-06-15 17:48 UTCEPSS rescore
  50. 2026-06-15 14:03 UTCMITRE cvelistV5CVSS v4 → 6.9
  51. 2026-06-15 03:24 UTCNVD updateCVSS v4 → 5.5
  52. 2026-06-15 02:53 UTCEG score recompute
  53. 2026-06-15 02:53 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12209?
CVE-2026-12209 is a medium vulnerability published on June 15, 2026. A security vulnerability has been detected in RubyLouvre avalon up to 2.2.10. The impacted element is an unknown function of the file src/filters/index.js of the component Template Filter Handler. Such manipulation leads to improperly controlled modification of object prototype attributes. It is…
When was CVE-2026-12209 disclosed?
CVE-2026-12209 was first published in the National Vulnerability Database on June 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12209 actively exploited?
CVE-2026-12209 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 23.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-12209?
CVE-2026-12209 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-12209?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12209, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-12209

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