A vulnerability, which was classified as critical, has been found in xxyopen/201206030 novel-plus up to 5.1.3. Affected by this issue is the function ajaxLogin of the file novel-admin/src/main/java/com/java2nb/system/controller/LoginController.java of the component CATCHA Handler. The manipulation leads to authentication bypass by capture-replay. The attack may be launched remotely. The complexity of an attack is rather high. The exploitation is known 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.
CVE-2025-6533
This medium-severity CVE scores 5.9 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 62% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.
- Lower severity and no public exploit yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.9
- EG Score
- 5.9(medium)
- EG Risk
- 43(Track)EG Risk 43/100SSVC: 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 computedSeverity59% × 45%Exploitation40% × 40%Automatability0% × 15%Action: Routine — remediate on your standard cadence. - EPSS
- 38.2%
- KEV
- Not listed
Published
June 24, 2025
Last Modified
June 17, 2026
References (6)
- cna@vuldbhttps://blog.0xd00.com/blog/captcha-replay-attack-lead-to-brute-force-protection-bypass
- cna@vuldbhttps://blog.0xd00.com/blog/captcha-replay-attack-lead-to-brute-force-protection-bypass#poc
- cna@vuldbhttps://vuldb.com/?ctiid.313652
- cna@vuldbhttps://vuldb.com/?id.313652
- cna@vuldbhttps://vuldb.com/?submit.596481
- 134c704f-9b21-4f2e-91b3-4a467353bcc0https://blog.0xd00.com/blog/captcha-replay-attack-lead-to-brute-force-protection-bypass
Weakness Classification(3)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 12× in last 7d / 47× 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 118 total refreshes for this CVE.
- 2026-07-23 03:01 UTCEG score recompute▲ 0.30
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- 2026-06-24 09:51 UTCNVD updateCVSS v3 → 5.9 · CVSS v4 → 2.9
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Frequently asked(5)
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Dependency Blast Radius
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