CVE-2024-29896Network attack vector

CSP bypass via automatic hashing of injected resources

Published Mar 28, 2024 · Updated Aug 2, 2024

Injection in Astro-Shield 1.2.0 allows remote attackers to bypass CSP protections through attacker-controlled SSR content. The middleware scans generated pages, fetches previously unseen script or style URLs, hashes their contents, and adds those hashes to the page CSP. Automated CSP header generation and externally controllable SSR content must both be enabled, after which injected inline or external scripts are allow-listed for browser execution.

CVSS severity7.5
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Injection in Astro-Shield 1.2.0 allows remote attackers to bypass CSP protections through attacker-controlled SSR content. The middleware scans generated pages, fetches previously unseen script or style URLs, hashes their contents, and adds those hashes to the page CSP. Automated CSP header generation and externally controllable SSR content must both be enabled, after which injected inline or external scripts are allow-listed for browser execution.

The record

CVE
CVE-2024-29896
Published
Mar 28, 2024
Updated
Aug 2, 2024
Vendor
KindSpells Labs
Product
Astro-Shield
Classifications
CWE-74, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 28, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion== 1.2.0
  2. Affected versionversion=1.2.0 <1.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

KindSpells Labs · Astro-Shieldversion== 1.2.0; version=1.2.0 <1.3.0

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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