CVE-2020-15164

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 10.0 under NVD CVSS v3. EPSS exploit probability: 1.2%, top 36% 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, nvd
Trending — 3 sources updated this week
10.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 10.0Exploit: NoneExposed: 0

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

in Scratch Login (MediaWiki extension) before version 1.1, any account can be logged into by using the same username with leading, trailing, or repeated underscore(s), since those are treated as whitespace and trimmed by MediaWiki. This affects all users on any wiki using this extension. Since version 1.1, comments by users whose usernames would be trimmed on MediaWiki are ignored when searching for the verification code.

CVSS v3
10.0
EG Score
10.0(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: Track

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
Severity100% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
64.2%
KEV
Not listed

Published

August 28, 2020

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Jul 18, 2026
Patch available. Sources: github_commit, github.
github Patch Available

Authentication Bypass by Alternate Name · Advisory · InternationalScratchWiki/mediawiki-scratch-login · GitHub

https://github.com/InternationalScratchWiki/mediawiki-scratch-login/security/advisories/GHSA-8fq5-g4m5-6j43
github_commit

commit 70849ef37501 (InternationalScratchWiki/mediawiki-scratch-login)

Fix landed in InternationalScratchWiki/mediawiki-scratch-login commit 70849ef37501 — awaiting tagged release

https://github.com/InternationalScratchWiki/mediawiki-scratch-login/commit/70849ef375016a1061490c8c4744046dbfc3e679

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 45× 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. 2026-07-23 01:49 UTCEG score recompute
  2. 2026-07-22 22:35 UTCEG score recompute
  3. 2026-07-22 14:05 UTCEPSS rescore
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  40. 2026-06-13 20:13 UTCOSV refresh
  41. 2026-06-12 23:09 UTCEPSS rescore
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  70. 2026-05-26 23:45 UTCEG score recompute
  71. 2026-05-26 13:42 UTCEPSS rescore
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  73. 2026-05-26 07:17 UTCEPSS rescore
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  75. 2026-05-24 16:21 UTCOSV refresh

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Frequently asked(5)

What is CVE-2020-15164?
CVE-2020-15164 is a critical vulnerability published on August 28, 2020. in Scratch Login (MediaWiki extension) before version 1.1, any account can be logged into by using the same username with leading, trailing, or repeated underscore(s), since those are treated as whitespace and trimmed by MediaWiki. This affects all users on any wiki using this extension. Since…
When was CVE-2020-15164 disclosed?
CVE-2020-15164 was first published in the National Vulnerability Database on August 28, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-15164 actively exploited?
CVE-2020-15164 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 64.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-15164?
CVE-2020-15164 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2020-15164?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-15164, 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.

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