CVE-2019-11488 — 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

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HIGH

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

Published Apr 25, 2019

8.1

HIGH

CVSS 3.0

EPSS 1.54%

Description

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.

Affected products

Remediation

No remediation recorded yet.

Metrics

1.54% 0.01540

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.01540

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3
EPSS v4

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3
EPSS v4

Table of values (14 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	1.54% (0.01540)	74.00th	v5 (v2026.06.15)
Jun 15, 2026	1.54% (0.01540)	71.58th	v5 (v2026.06.15)
Mar 17, 2025	0.60% (0.00598)	67.55th	v4 (v2025.03.14)
Dec 17, 2024	1.72% (0.01718)	87.50th	v3 (v2023.03.01)
Apr 3, 2024	1.51% (0.01512)	86.72th	v3 (v2023.03.01)
Sep 3, 2023	0.76% (0.00757)	78.80th	v3 (v2023.03.01)
Mar 7, 2023	1.07% (0.01071)	81.96th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Apr 1, 2022	0.89% (0.00885)	24.24th	v2 (v2022.01.01)
Feb 4, 2022	10.85% (0.10855)	88.34th	v2 (v2022.01.01)
Feb 3, 2022	2.91% (0.02909)	64.88th	v1
Jan 6, 2022	2.91% (0.02909)	64.55th	v1
Jan 5, 2022	0.66% (0.00663)	48.81th	v5 (v2026.06.15)
Apr 14, 2021	0.66% (0.00663)	0.00th	v1

Weaknesses (1)

CWE-287

Improper Authentication

References (2)

https://blog.cybrgrade.com/CVE-2019-11488-SimplyBook.me-hash-replay-attack/
x_refsource_MISCExploitThird Party Advisory
https://cybrgrade.com/files/Report_SimplyBookIt_MD5_Hash_Replay_by_CybrGradeUKLtd.pdf
x_refsource_MISCExploitTechnical DescriptionThird Party Advisory

Link	Providers	Tags
https://blog.cybrgrade.com/CVE-2019-11488-SimplyBook.me-hash-replay-attack/		x_refsource_MISCExploitThird Party Advisory
https://cybrgrade.com/files/Report_SimplyBookIt_MD5_Hash_Replay_by_CybrGradeUKLtd.pdf		x_refsource_MISCExploitTechnical DescriptionThird Party Advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner mitre

Published Apr 25, 2019

Updated Aug 4, 2024

Reserved Apr 23, 2019

Link CVE-2019-11488

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2019-11488

Red Hat

Severity n/a

Public date n/a

Links CVE-2019-11488