CVE-2020-27388

MEDIUMNVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under NVD CVSS v3. EPSS exploit probability: 0.7% (51st percentile of EPSS-scored CVEs). 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, nvd
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 5.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Multiple Stored Cross Site Scripting (XSS) vulnerabilities exist in the YOURLS Admin Panel, Versions 1.5 - 1.7.10. An authenticated user must modify a PHP plugin with a malicious payload and upload it, resulting in multiple stored XSS issues.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100CISA 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
Severity54% × 45%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
52nd
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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

October 23, 2020

Last Modified

July 9, 2026

Advisory Details (2)

Auto-updated Jul 9, 2026
Patch available. Sources: github_pr.
generic

Hack the Galaxy

https://johnjhacking.com/blog/cve-2020-27388/
github_pr Patch Available

Sanitize plugin file header before display

Patch available: YOURLS/YOURLS 1.8 (PR #2761 merged 2020-10-11)

https://github.com/YOURLS/YOURLS/pull/2761

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
yourls/yourls1.7.1 ... 1.7.9 (7 versions)
  • 1.5 up to 1.8: fixed in 1.8
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 24× 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 153 total refreshes for this CVE.

  1. 2026-10-05 17:39 UTCEPSS rescore
  2. 2026-10-04 23:18 UTCEPSS rescore
  3. 2026-10-03 14:22 UTCEPSS rescore
  4. 2026-09-30 15:17 UTCEG score recompute
  5. 2026-09-30 14:59 UTCEPSS rescore
  6. 2026-09-29 15:14 UTCEPSS rescore
  7. 2026-09-27 13:41 UTCEPSS rescore
  8. 2026-09-26 15:54 UTCEPSS rescore
  9. 2026-09-26 15:54 UTCEPSS rescore
  10. 2026-09-24 14:00 UTCEPSS rescore
  11. 2026-09-22 14:43 UTCEPSS rescore
  12. 2026-09-21 20:28 UTCEPSS rescore
  13. 2026-09-20 20:11 UTCEPSS rescore
  14. 2026-09-19 15:37 UTCEPSS rescore
  15. 2026-09-18 19:23 UTCEPSS rescore
  16. 2026-09-17 19:22 UTCEPSS rescore
  17. 2026-09-16 14:04 UTCEPSS rescore
  18. 2026-09-15 03:06 UTCEPSS rescore
  19. 2026-09-13 16:43 UTCEPSS rescore
  20. 2026-09-12 14:57 UTCEPSS rescore
  21. 2026-09-11 09:32 UTCEPSS rescore
  22. 2026-09-08 21:56 UTCEPSS rescore
  23. 2026-09-07 15:57 UTCEPSS rescore
  24. 2026-09-06 13:44 UTCEPSS rescore
  25. 2026-09-05 15:24 UTCEPSS rescore
Show 75 more
  1. 2026-09-04 13:57 UTCEPSS rescore
  2. 2026-09-04 05:03 UTCEPSS rescore
  3. 2026-09-02 14:08 UTCEPSS rescore
  4. 2026-09-01 03:32 UTCEPSS rescore
  5. 2026-08-30 19:14 UTCEPSS rescore
  6. 2026-08-30 01:18 UTCEPSS rescore
  7. 2026-08-27 14:21 UTCEPSS rescore
  8. 2026-08-26 14:42 UTCEPSS rescore
  9. 2026-08-25 13:45 UTCEPSS rescore
  10. 2026-08-21 23:45 UTCEPSS rescore
  11. 2026-08-20 22:52 UTCEPSS rescore
  12. 2026-08-19 17:00 UTCEPSS rescore
  13. 2026-08-18 13:44 UTCEPSS rescore
  14. 2026-08-17 13:43 UTCEPSS rescore
  15. 2026-08-16 14:52 UTCEPSS rescore
  16. 2026-08-16 02:11 UTCEPSS rescore
  17. 2026-08-15 01:26 UTCEPSS rescore
  18. 2026-08-13 21:57 UTCEPSS rescore
  19. 2026-08-12 13:47 UTCEPSS rescore
  20. 2026-08-09 13:43 UTCEPSS rescore
  21. 2026-08-08 16:33 UTCEPSS rescore
  22. 2026-08-07 16:23 UTCEPSS rescore
  23. 2026-08-06 13:43 UTCEPSS rescore
  24. 2026-08-04 15:06 UTCEPSS rescore
  25. 2026-08-04 10:34 UTCEPSS rescore
  26. 2026-08-02 02:23 UTCEPSS rescore
  27. 2026-08-01 04:12 UTCEPSS rescore
  28. 2026-07-30 16:25 UTCEPSS rescore
  29. 2026-07-30 01:27 UTCEPSS rescore
  30. 2026-07-28 15:33 UTCEPSS rescore
  31. 2026-07-26 14:51 UTCEPSS rescore
  32. 2026-07-25 14:15 UTCEPSS rescore
  33. 2026-07-24 14:14 UTCEPSS rescore
  34. 2026-07-23 14:15 UTCEPSS rescore
  35. 2026-07-23 14:15 UTCEPSS rescore
  36. 2026-07-23 01:52 UTCEG score recompute
  37. 2026-07-22 22:38 UTCEG score recompute
  38. 2026-07-22 14:05 UTCEPSS rescore
  39. 2026-07-21 15:22 UTCEPSS rescore
  40. 2026-07-21 15:22 UTCEPSS rescore
  41. 2026-07-20 17:04 UTCEPSS rescore
  42. 2026-07-20 17:04 UTCEPSS rescore
  43. 2026-07-19 14:28 UTCEPSS rescore
  44. 2026-07-19 14:28 UTCEPSS rescore
  45. 2026-07-19 02:26 UTCEPSS rescore
  46. 2026-07-19 02:26 UTCEPSS rescore
  47. 2026-07-16 16:59 UTCEPSS rescore
  48. 2026-07-15 16:55 UTCEPSS rescore
  49. 2026-07-15 16:55 UTCEPSS rescore
  50. 2026-07-15 01:57 UTCEPSS rescore
  51. 2026-07-13 22:27 UTCEPSS rescore
  52. 2026-07-13 22:27 UTCEPSS rescore
  53. 2026-07-13 06:10 UTCEPSS rescore
  54. 2026-07-13 06:10 UTCEPSS rescore
  55. 2026-07-12 05:44 UTCEPSS rescore
  56. 2026-07-11 08:25 UTCEPSS rescore
  57. 2026-07-11 08:25 UTCEPSS rescore
  58. 2026-07-09 19:07 UTCEPSS rescore
  59. 2026-07-09 02:55 UTCNVD updateCVSS v3 → 5.4 · severity → MEDIUM
  60. 2026-07-09 01:24 UTCMITRE cvelistV5
  61. 2026-07-08 15:12 UTCEPSS rescore
  62. 2026-07-07 13:43 UTCEPSS rescore
  63. 2026-07-06 16:25 UTCEPSS rescore
  64. 2026-07-06 16:25 UTCEPSS rescore
  65. 2026-07-06 02:21 UTCEPSS rescore
  66. 2026-07-06 02:21 UTCEPSS rescore
  67. 2026-07-05 00:28 UTCNVD updateCVSS v3 → 5.4 · severity → MEDIUM
  68. 2026-07-04 23:57 UTCMITRE cvelistV5
  69. 2026-07-04 06:29 UTCEPSS rescore
  70. 2026-07-04 06:29 UTCEPSS rescore
  71. 2026-06-30 23:20 UTCEPSS rescore
  72. 2026-06-30 23:20 UTCEPSS rescore
  73. 2026-06-28 04:54 UTCEPSS rescore
  74. 2026-06-28 04:54 UTCEPSS rescore
  75. 2026-06-27 03:06 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2020-27388?
CVE-2020-27388 is a medium vulnerability published on October 23, 2020. Multiple Stored Cross Site Scripting (XSS) vulnerabilities exist in the YOURLS Admin Panel, Versions 1.5 - 1.7.10. An authenticated user must modify a PHP plugin with a malicious payload and upload it, resulting in multiple stored XSS issues.
When was CVE-2020-27388 disclosed?
CVE-2020-27388 was first published on October 23, 2020, with the most recent update on July 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-27388 actively exploited?
CVE-2020-27388 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-27388?
CVE-2020-27388 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2020-27388?
A fix for CVE-2020-27388 is available: update to the fixed version the vendor names in its advisory.

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