CVE-2026-55877

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 73% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Symfony UX is a JavaScript ecosystem for Symfony. From 2.17.0 before 2.36.1 and from 3.0.0 before 3.2.0, the ux_icon() Twig function is marked is_safe=['html'] and Icon::toHtml() inlines SVG source verbatim, allowing unsanitized local SVG files or Iconify on-demand JSON body responses containing nested script elements, on* event handlers, or dangerous URL schemes to execute cross-site scripting. This issue is fixed in versions 2.36.1 and 3.2.0.

CVSS v3
6.1
EG Score
6.1MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100

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
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
EPSS PROB
0.3%
EPSS %ILE
25th
KEV
Not listed

Published

June 19, 2026

Last Modified

August 19, 2026

Advisory Details (4)

Auto-updated Jul 8, 2026
Patch available. Sources: github_commit, github_release, github.
githubMentions a patch (unverified)

XSS in symfony/ux-icons via unsanitized SVG content in local files and Iconify on-demand responses · Advisory · symfony/ux · GitHub

https://github.com/symfony/ux/security/advisories/GHSA-6v8j-33hc-mv84
github_release Patch Available

v3.2.0

Patch available: symfony/ux v3.2.0

https://github.com/symfony/ux/releases/tag/v3.2.0
github_release Patch Available

v2.36.1

Patch available: symfony/ux v2.36.1

https://github.com/symfony/ux/releases/tag/v2.36.1
github_commit Patch Available

commit 3a4964ec3700 (symfony/ux)

Patch available: symfony/ux v2.36.1 (contains commit 3a4964ec3700)

https://github.com/symfony/ux/commit/3a4964ec3700f0af4e13f7bfbf8bb3174c3e79d1

Vendor Advisories for CVE-2026-55877(1)

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

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
symfony/ux-iconsv3.0.0, v3.1.0
  • 2.17.0 up to 2.36.1: fixed in 2.36.1
  • 3.0.0 up to 3.2.0: fixed in 3.2.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 26× 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 113 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-55877?
CVE-2026-55877 is a medium vulnerability published on June 19, 2026. Symfony UX is a JavaScript ecosystem for Symfony. From 2.17.0 before 2.36.1 and from 3.0.0 before 3.2.0, the uxicon() Twig function is marked issafe=['html'] and Icon::toHtml() inlines SVG source verbatim, allowing unsanitized local SVG files or Iconify on-demand JSON body responses containing…
When was CVE-2026-55877 disclosed?
CVE-2026-55877 was first published on June 19, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55877 actively exploited?
CVE-2026-55877 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (25th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55877?
CVE-2026-55877 has a CVSS base score of 6.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55877?
A fix for CVE-2026-55877 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55877 are linked in the Vendor Advisories panel on this page.

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