CVE-2026-77826: unknown registrationmagic Improper Authentication
Vulnerability summary
CVE-2026-77826 is a critical (CVSS 9.8) Improper Authentication vulnerability in unknown registrationmagic. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 33.5% of scored vulnerabilities. 1 public exploit is recorded. Fixed in 6.0.9.9.
Timeline
- 05-09-2026PublishedVulnerability first disclosed.
- 06-09-2026Last modifiedVulnerability information updated.
Description
The RegistrationMagic WordPress plugin before 6.0.9.9 does not verify which application a Facebook access token was issued to before accepting it as proof of identity, allowing unauthenticated attackers to log in as an existing user whose token they can obtain, or to create and log into a new account even when user registration is disabled.
CVSS metrics
3 scores · 3 sources · 1 version- CVE.orgCNA8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HDiffers
- NVDNIST8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HDiffers
EPSS trend
Probability
0.41%
Chance of exploitation in the next 30 days
Percentile
34%
Versus all other CVEs
30-day change
+0.13 pp
From 0.27% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (wpscan.com)
Maturity: unknown
Weaknesses
CWE · root cause- CWE-287Improper AuthenticationWhen an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
- CWE-288Authentication Bypass Using an Alternate Path or ChannelThe product requires authentication, but the product has an alternate path or channel that does not require authentication.
Affected systems
Unknown1 product
- registrationmagic≥ 5.0.1.8, < 6.0.9.9
Wordpress1 product
- custom-registration-form-builder-with-submission-manager≤ 6.0.9.8 (fixed in 6.0.9.9)
2 vendors · 2 products