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Vulnerability details: VCID-bxfp-83uc-rqfw
Vulnerability ID VCID-bxfp-83uc-rqfw
Aliases CVE-2021-33040
GHSA-c6rp-xvqv-mwmf
Summary Cross-site Scripting in epubjs
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00307 https://api.first.org/data/v1/epss?cve=CVE-2021-33040
epss 0.00307 https://api.first.org/data/v1/epss?cve=CVE-2021-33040
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-c6rp-xvqv-mwmf
cvssv3.1 6.1 https://github.com/futurepress/epub.js
generic_textual MODERATE https://github.com/futurepress/epub.js
cvssv3.1 6.1 https://github.com/futurepress/epub.js/blob/5c7f21d648d9d20d44c6c365d164b16871847023/src/managers/views/iframe.js#L373
generic_textual MODERATE https://github.com/futurepress/epub.js/blob/5c7f21d648d9d20d44c6c365d164b16871847023/src/managers/views/iframe.js#L373
cvssv3.1 6.1 https://github.com/futurepress/epub.js/commit/ab4dd46408cce0324e1c67de4a3ba96b59e5012e
generic_textual MODERATE https://github.com/futurepress/epub.js/commit/ab4dd46408cce0324e1c67de4a3ba96b59e5012e
cvssv3.1 6.1 https://github.com/futurepress/epub.js/compare/v0.3.88...v0.3.89
generic_textual MODERATE https://github.com/futurepress/epub.js/compare/v0.3.88...v0.3.89
cvssv3.1 6.1 https://nvd.nist.gov/vuln/detail/CVE-2021-33040
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-33040
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-33040
https://github.com/futurepress/epub.js
https://github.com/futurepress/epub.js/blob/5c7f21d648d9d20d44c6c365d164b16871847023/src/managers/views/iframe.js#L373
https://github.com/futurepress/epub.js/commit/ab4dd46408cce0324e1c67de4a3ba96b59e5012e
https://github.com/futurepress/epub.js/compare/v0.3.88...v0.3.89
CVE-2021-33040 https://nvd.nist.gov/vuln/detail/CVE-2021-33040
GHSA-c6rp-xvqv-mwmf https://github.com/advisories/GHSA-c6rp-xvqv-mwmf
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/futurepress/epub.js
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:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/futurepress/epub.js/blob/5c7f21d648d9d20d44c6c365d164b16871847023/src/managers/views/iframe.js#L373
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:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/futurepress/epub.js/commit/ab4dd46408cce0324e1c67de4a3ba96b59e5012e
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:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/futurepress/epub.js/compare/v0.3.88...v0.3.89
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:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-33040
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 0.54312
EPSS Score 0.00307
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T20:27:38.872669+00:00 GHSA Importer Import https://github.com/advisories/GHSA-c6rp-xvqv-mwmf 38.6.0