What is CVE-2023-28204?A medium-severity flaw criminals are using now.
CVE-2023-28204 is a medium-severity flaw (CVSS 6.5) in Safari from Apple, published on 23 June 2023. It is on the list of flaws known to be exploited, so criminals are already using it. The latest forecast puts its chance of use in the next 30 days at 14%. If you run an affected version, patch it first.
Published 23 June 2023. Record last updated 23 October 2025. We keep this page's data up to date.
What is CVE-2023-28204? In plain terms.
It can be attacked from anywhere on the internet without logging in, but a person has to take an action first. If it works, the attacker can read data.
An out-of-bounds read was addressed with improved input validation. This issue is fixed in watchOS 9.5, tvOS 16.5, macOS Ventura 13.4, iOS 15.7.6 and iPadOS 15.7.6, Safari 16.5, iOS 16.5 and iPadOS 16.5. Processing web content may disclose sensitive information. Apple is aware of a report that this issue may have been actively exploited.
What kind of flaw is it?
- CWE-125Out-of-bounds Read
How an attack on it works
Read straight from its severity rating, translated out of the shorthand.
- Where an attacker can beAnywhere on the internet
- How hard it is to pull offEasy: no special conditions
- Login needed firstNo login needed
- Does someone have to clickYes, a person has to take an action
- What an attacker getsCan read data
Severity vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Is CVE-2023-28204 being exploited? Yes.
Attackers are already using it. It is on the government list of flaws known to be exploited, and the latest forecast puts the chance of it being used in the next 30 days at 14%.
Timeline
- Published
- Record last updated
- Exploit likelihood jumped
CVE-2023-28204 scores 74. Action: Emergency patch.
We keep the score of every published flaw up to date as the evidence changes. Four things go into the score, and evidence that criminals are actually using it counts most. In order:
- Evidence it is being exploitedBiggest factor
- How severe it isStrong factor
- How widely exposed it isSmaller factor
- Threat activity around itSmaller factor
85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score.
When CVE-2023-28204 matches software you track, it lands in your list with its score and the reasons behind it.
See your own ranked list →Who is affected by CVE-2023-28204? 7 products.
The published record lists 7 products from 2 vendors. Versions are shown as published: "before 16.5" means every version up to, but not including, 16.5. If you run one of these, check your version, then go to the fix below.
- Application
Safari
by Apple
Affected versionsbefore 16.5 - Operating system
iPadOS
by Apple
Affected versionsbefore 15.7.616.0 to before 16.5 - Operating system
iOS
by Apple
Affected versionsbefore 15.7.616.0 to before 16.5 - Operating system
macOS
by Apple
Affected versions13.0 to before 13.4 - Operating system
tvOS
by Apple
Affected versionsbefore 16.5 - Operating system
watchOS
by Apple
Affected versionsbefore 9.5 - Application
Webkitgtk+
by Webkitgtk
Affected versionsbefore 2.42.3
How do I fix CVE-2023-28204? Four steps.
- Check whether you run itCompare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list.
- Apply the vendor’s fixInstall the update named in the vendor’s advisory. We’ve put the advisories and patch notes first in the list.
- If you can’t patch todayFollow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in.
- Check it wasn’t used before you patchedBecause criminals are already using this flaw, look for signs of a break-in on affected systems using the vendor’s guidance.
Does CVE-2023-28204 affect you? We'll keep checking.
Looking flaws up one at a time doesn't scale. Tell us what you run once, and we tell you which flaws matter to you, in what order, and keep watching for new ones.
- Tell us what you runPick your software from a list, or let us work it out from your website.
- We match it to every flawOver 400,000 published flaws, checked against your list.
- Ranked by real-world riskA 0 to 100 score, led by evidence criminals are using it.
- Told as soon as we knowAn alert by email, in the app or by webhook to your own tools.
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1 flaw being exploited affects software Acme tracks
An out-of-bounds read was addressed with improved input validation. This issue is fixed in watchOS 9.5, tvOS 16.5, macOS Ventura 13.4, iOS 15.7.6 and iPadOS ...
- Matched to
- Safari on Acme's software list
- What to do
- Patch first, then check for signs of use
Sent to the alert recipients Acme chose. Also in the app and to Acme's webhook.
CVE-2023-28204 is a medium-severity flaw in Safari from Apple, published on 23 June 2023. It can be attacked from anywhere on the internet without logging in, but a person has to take an action first. If it works, the attacker can read data.
It scores 6.5 out of 10 on the CVSS severity scale, which is medium. Our risk score for CVE-2023-28204 is 74 out of 100, which is High. Its action is "Emergency patch". Attackers are using this flaw today. If you run an affected version, it goes to the top of your list.
Attackers are already using it. It is on the government list of flaws known to be exploited, and the latest forecast puts the chance of it being used in the next 30 days at 14%.
For Safari from Apple: before 16.5. The record lists 7 products in all, each with its versions, under "Who is affected" on this page.
Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet. Because criminals are already using it, also check affected systems for signs of a break-in.