CVE-2026-54047

CRITICALPre-NVD 9.29.2—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 87% 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
Trending — 3 sources updated this week
9.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.2Exploit: None knownExposed: 0

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

Laci Synchroni is a decentralized mod and appearance sync server and plugin for Dalamud. Versions of the backend prior to 1.2.3 have an improper authentication vulnerability in the application's OAuth2 login flow. The application relies on client-side state by trusting the UID field inside the Authentications object of a user's local config.json file. By manually editing this local file on their PC prior to logging in, a user can supply an arbitrary UID. Because the server fails to validate that the authenticated OAuth2 identity matches the requested UID, an attacker can fully impersonate any target user and perform actions on their behalf. This issue has been resolved in version 1.2.3. The patch modifies AuthorizeOauthAsync inside the SecretKeyAuthenticatorService to strictly bind the lookup of the requested User ID (requestedUid) to the record of the successfully authenticated identity (primaryUid). The server will no longer load or return session tokens for a requested UID unless it matches the verified, authenticated database record. No known workarounds are available.

CVSS v3
9.2
EG Score
9.2(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity92% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

September 11, 2026

Last Modified

September 11, 2026

Advisory Details (4)

Auto-updated Sep 11, 2026
Patch available. Sources: github_release, github, github_pr, github_commit.
github_release Patch Available

v1.2.3

Patch available: LaciSynchroni/server v1.2.3

https://github.com/LaciSynchroni/server/releases/tag/v1.2.3
github_commit Patch Available

commit 5bc3efd68b73 (LaciSynchroni/server)

Patch available: LaciSynchroni/server v1.2.3 (contains commit 5bc3efd68b73)

https://github.com/LaciSynchroni/server/commit/5bc3efd68b738328b8faeff089dd18a826ec9ca4
github_pr Patch Available

fix: thing

Patch available: LaciSynchroni/server v1.2.3 (PR #28 merged 2026-06-01)

https://github.com/LaciSynchroni/server/pull/28
github Patch Available

Account Takeover / User Impersonation via Client-Side Configuration Manipulation · Advisory · LaciSynchroni/server · GitHub

https://github.com/LaciSynchroni/server/security/advisories/GHSA-gq4p-pxvg-6x9j

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 9× 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. 2026-09-15 03:13 UTCEG score recompute
  2. 2026-09-13 17:24 UTCEG score recompute
  3. 2026-09-13 16:47 UTCEPSS rescore
  4. 2026-09-12 15:06 UTCEG score recompute
  5. 2026-09-11 20:18 UTCEG score recompute
  6. 2026-09-11 19:28 UTCEG score recompute
  7. 2026-09-11 17:32 UTCEG score recompute
  8. 2026-09-11 16:29 UTCEG score recompute
  9. 2026-09-11 16:28 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-54047?
CVE-2026-54047 is a critical vulnerability published on September 11, 2026. Laci Synchroni is a decentralized mod and appearance sync server and plugin for Dalamud. Versions of the backend prior to 1.2.3 have an improper authentication vulnerability in the application's OAuth2 login flow. The application relies on client-side state by trusting the UID field inside the…
When was CVE-2026-54047 disclosed?
CVE-2026-54047 was first published in the National Vulnerability Database on September 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54047 actively exploited?
CVE-2026-54047 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 86.6% of all scored CVEs.
What is the CVSS score of CVE-2026-54047?
CVE-2026-54047 has a CVSS v3 base score of 9.2 (NVD).
How do I remediate CVE-2026-54047?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54047, 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

Explore the affected products and dependency analysis for CVE-2026-54047

Explore →

Is Your Infrastructure Affected by CVE-2026-54047?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs