Staging Environment: Content and features may be unstable or change without notice.
Search for vulnerabilities
Vulnerability details: VCID-1nxf-g588-c3ey
Vulnerability ID VCID-1nxf-g588-c3ey
Aliases CVE-2026-33877
GHSA-mj7r-x3h3-7rmr
Summary ApostropheCMS is an open-source Node.js content management system. Versions 4.28.0 and prior contain a timing side-channel vulnerability in the password reset endpoint (/api/v1/@apostrophecms/login/reset-request) that allows unauthenticated username and email enumeration. When a user is not found, the handler returns after a fixed 2-second artificial delay, but when a valid user is found, it performs a MongoDB update and SMTP email send with no equivalent delay normalization, producing measurably different response times. The endpoint also accepts both username and email via an $or query, and has no rate limiting as the existing checkLoginAttempts throttle only applies to the login flow. This enables automated enumeration of valid accounts for use in credential stuffing or targeted phishing. Only instances that have explicitly enabled the passwordReset option are affected, as it defaults to false. This issue has been fixed in version 4.29.0.
Status Published
Exploitability 0.5
Weighted Severity 3.3
Risk 1.6
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-208 Observable Timing Discrepancy
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00029 https://api.first.org/data/v1/epss?cve=CVE-2026-33877
cvssv3.1_qr LOW https://github.com/advisories/GHSA-mj7r-x3h3-7rmr
cvssv3.1 3.7 https://github.com/apostrophecms/apostrophe
generic_textual LOW https://github.com/apostrophecms/apostrophe
cvssv3.1 3.7 https://github.com/apostrophecms/apostrophe/commit/e266cffd8c0d331a9b05c92bf11616556efcdc77
generic_textual LOW https://github.com/apostrophecms/apostrophe/commit/e266cffd8c0d331a9b05c92bf11616556efcdc77
ssvc Track https://github.com/apostrophecms/apostrophe/commit/e266cffd8c0d331a9b05c92bf11616556efcdc77
cvssv3.1 3.7 https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-mj7r-x3h3-7rmr
cvssv3.1_qr LOW https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-mj7r-x3h3-7rmr
generic_textual LOW https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-mj7r-x3h3-7rmr
ssvc Track https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-mj7r-x3h3-7rmr
cvssv3.1 3.7 https://nvd.nist.gov/vuln/detail/CVE-2026-33877
generic_textual LOW https://nvd.nist.gov/vuln/detail/CVE-2026-33877
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-33877
https://github.com/apostrophecms/apostrophe
https://nvd.nist.gov/vuln/detail/CVE-2026-33877
e266cffd8c0d331a9b05c92bf11616556efcdc77 https://github.com/apostrophecms/apostrophe/commit/e266cffd8c0d331a9b05c92bf11616556efcdc77
GHSA-mj7r-x3h3-7rmr https://github.com/advisories/GHSA-mj7r-x3h3-7rmr
GHSA-mj7r-x3h3-7rmr https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-mj7r-x3h3-7rmr
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://github.com/apostrophecms/apostrophe
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://github.com/apostrophecms/apostrophe/commit/e266cffd8c0d331a9b05c92bf11616556efcdc77
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-15T19:30:48Z/ Found at https://github.com/apostrophecms/apostrophe/commit/e266cffd8c0d331a9b05c92bf11616556efcdc77
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-mj7r-x3h3-7rmr
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-15T19:30:48Z/ Found at https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-mj7r-x3h3-7rmr
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-33877
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.08901
EPSS Score 0.00029
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:49:47.990650+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/33xxx/CVE-2026-33877.json 38.6.0