langhsu Mblog Blog System login observable response discrepancy

published 2025-01-09 22 mo ago modified 2026-06-17 4 mo ago also EUVD-2024-51420

cvss: 3.7; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits: 0; none known

A vulnerability classified as problematic has been found in langhsu Mblog Blog System 3.5.0. Affected is an unknown function of the file /login. The manipulation leads to observable response discrepancy. It is possible to launch the attack remotely. The complexity of an attack is rather high. The exploitability is told to be difficult. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 21 mo ago (2025-01-09)

Exploit prediction

0.70% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/cydtseng/Vulnerability-Research/blob/main/mblog/ObservableDiscrepancy-UserLogin.md referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	6.3	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CNA	3.1	3.7	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA	3.0	3.7	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA	2.0	2.6	AV:N/AC:H/Au:N/C:P/I:N/A:N
CNA	4.0	6.3	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

langhsu Mblog Blog System

Classification

Weakness

CWE-204 Observable Response Discrepancy
CWE-203 Observable Discrepancy

References

github.com /cydtseng/Vulnerability-Research/blob/main/mblog/ObservableDiscrepancy-UserLogin.md
exploit, mitigation, third-party-advisory
vuldb.com /?id.290790
vdb-entry, third-party-advisory
vuldb.com /?ctiid.290790
signature, permissions-required, vdb-entry
vuldb.com /?submit.470429
third-party-advisory, vdb-entry

Sources

CVE List CVE-2024-13198
NVD CVE-2024-13198

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary