Tinyauth is an authentication and authorization server. Prior to 5.1.0, Tinyauth exposes a remotely observable timing difference between authentication attempts for existing and nonexistent local usernames. internal/controller/user_controller.go loginHandler and internal/middleware/context_middleware.go basicAuth return quickly after internal/service/auth_service.go reports a missing user, while an existing user causes bcrypt password verification work. Repeated measurements can therefore disclose valid usernames and support targeted credential attacks. This issue is fixed in version 5.1.0.
CVE-2026-77582
MEDIUMPre-NVD 6.96.9—Trending — 3 sources updated this weekElevated
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 6.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 61% 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
6.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.9Exploit: Elevated riskExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.9
- EG Score
- 6.9(medium)
- EG Risk
- 62(Attend)EG Risk 62/100SSVC: Attend
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 computedSeverity69% × 45%Exploitation40% × 40%Automatability100% × 15%Action: Remediate soon — notable exploitation risk. - EPSS PROB
- 0%
- EPSS %ILE
- 39%
- KEV
- Not listed
Published
September 21, 2026
Last Modified
September 23, 2026
Advisory Details (4)
Auto-updated Sep 21, 2026🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available
v5.1.0
Patch available: tinyauthapp/tinyauth v5.1.0
https://github.com/tinyauthapp/tinyauth/releases/tag/v5.1.0github_commit Patch Available
commit c22925c2fba9 (tinyauthapp/tinyauth)
Patch available: tinyauthapp/tinyauth v5.1.0-rc.2 (contains commit c22925c2fba9)
https://github.com/tinyauthapp/tinyauth/commit/c22925c2fba981875d0a2b09dd3ee41c0ae4c310github_pr Patch Available
fix: use constant time in user checks
Patch available: tinyauthapp/tinyauth v5.1.0-rc.2 (PR #1004 merged 2026-07-14)
https://github.com/tinyauthapp/tinyauth/pull/1004github Patch Available🟡 PoC Available
User enumeration attack by timing oracle · Advisory · tinyauthapp/tinyauth · GitHub
https://github.com/tinyauthapp/tinyauth/security/advisories/GHSA-456h-ww26-f758Vendor Advisories for CVE-2026-77582(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)
Go(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| github.com/tinyauthapp/tinyauth | — | 1.0.1-0.20260714134959-c22925c2fba9 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 10× in last 7d / 10× 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.
- 2026-09-24 18:09 UTCEG score recompute
- 2026-09-24 14:04 UTCEPSS rescore
- 2026-09-23 20:24 UTCEG score recompute
- 2026-09-23 19:19 UTCEG score recompute
- 2026-09-23 17:54 UTCEPSS rescore
- 2026-09-23 12:55 UTCEG score recompute
- 2026-09-22 16:01 UTCEPSS rescore
- 2026-09-21 17:25 UTCEG score recompute
- 2026-09-21 16:50 UTCEG score recompute
- 2026-09-21 16:50 UTCMITRE cvelistV5first tracked
Related CVEs(same product + same CWE)
Frequently asked(5)
What is CVE-2026-77582?
CVE-2026-77582 is a medium vulnerability published on September 21, 2026. Tinyauth is an authentication and authorization server. Prior to 5.1.0, Tinyauth exposes a remotely observable timing difference between authentication attempts for existing and nonexistent local usernames. internal/controller/usercontroller.go loginHandler and…
When was CVE-2026-77582 disclosed?
CVE-2026-77582 was first published in the National Vulnerability Database on September 21, 2026, with the most recent update on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77582 actively exploited?
CVE-2026-77582 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 61.2% of all scored CVEs.
What is the CVSS score of CVE-2026-77582?
CVE-2026-77582 has a CVSS v3 base score of 6.9 (NVD).
How do I remediate CVE-2026-77582?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77582, 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
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-77582
Is Your Infrastructure Affected by CVE-2026-77582?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.