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Fencer Vulns
high 8.1

CVE-2019-11488 json

Incorrect Access Control in the Account Access / Password Reset Link in SimplyBook.me Enterprise before 2019-04-23 allows Unauthorized Atta…

published 2019-04-25 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-3161

cvss
8.1
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

Incorrect Access Control in the Account Access / Password Reset Link in SimplyBook.me Enterprise before 2019-04-23 allows Unauthorized Attackers to READ/WRITE Customer or Administrator data via a persistent HTTP GET Request Hash Link Replay, as demonstrated by a login-link from the browser history.

Patch / fix

  • simplybook simplybook 2019-04-23

Exploit prediction

1.54% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • cybrgrade.com https://cybrgrade.com/files/Report_SimplyBookIt_MD5_Hash_Replay_by_CybrGradeUKLtd.pdf referenced PoC, tagged "exploit" by a source, unverified
  • blog.cybrgrade.com https://blog.cybrgrade.com/CVE-2019-11488-SimplyBook.me-hash-replay-attack/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 8.1 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

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.