CVE-2026-50635

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-09. A secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fixed version is listed under Patch Availability — apply it.

LimeSurvey constructs account password-reset links from the client-supplied HTTP Host header without validating it. The optional allowedHosts allowlist that would constrain this is undefined in the default (and documented) configuration, so LSHttpRequest::checkIsAllowedHost() results in no operation. A remote, unauthenticated attacker who submits a forgotten-password request for a known account (requiring only the target's username and email) with a spoofed Host header causes LimeSurvey to email that account a reset link whose hostname is attacker-controlled while embedding the genuine validation_key. When the recipient or an automated inbound mail-security link scanner dereferences the link, the valid reset token is disclosed to the attacker, who replays it against the legitimate host's newPassword endpoint to set a new password and take over the account.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA SSVC

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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fixed version is listed under Patch Availability. Apply it within your standard update timelines.
EPSS PROB
0.7%
EPSS %ILE
50th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fixed version is listed under Patch Availability. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

June 9, 2026

Last Modified

October 8, 2026

Advisory Details (3)

Auto-updated Jun 9, 2026
Fixed version listed under Patch Availability. Sources: github_pr.
generic

LimeSurvey Password Reset Host Header Injection Discloses Reset Token | Advisories | VulnCheck

https://www.vulncheck.com/advisories/limesurvey-password-reset-host-header-injection-discloses-reset-token
generic

LimeSurvey — Free Online Survey Tool

https://www.limesurvey.org/
github_pr

Fixed issue #20548: [security] Host Header Injection in Password Reset

Fix merged in LimeSurvey/LimeSurvey PR #5032 on 2026-06-09 — awaiting tagged release

https://github.com/LimeSurvey/LimeSurvey/pull/5032

Vendor Advisories for CVE-2026-50635(1)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
composerlimesurvey/limesurvey—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
limesurvey/limesurvey1.0.4 ... 6.9.0+241218 (741 versions)
  • every version through 7.0.0-beta1: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 28× 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 282 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-50635?
CVE-2026-50635 is a high vulnerability published on June 9, 2026. LimeSurvey constructs account password-reset links from the client-supplied HTTP Host header without validating it. The optional allowedHosts allowlist that would constrain this is undefined in the default (and documented) configuration, so LSHttpRequest::checkIsAllowedHost() results in no…
When was CVE-2026-50635 disclosed?
CVE-2026-50635 was first published on June 9, 2026, with the most recent update on October 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-50635 actively exploited?
CVE-2026-50635 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (50th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-50635?
CVE-2026-50635 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-50635?
A fixed version for CVE-2026-50635 is listed under Patch Availability on this page: update to the version listed for your package. The vendor advisories EchelonGraph has for CVE-2026-50635 are linked in the Vendor Advisories panel on this page.

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