diff --git a/CHANGELOG b/CHANGELOG
index fe216aef71..e1857de747 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,11 @@
 This is the changelog file for the POCO C++ Libraries.
 
+Release 1.11.8p1 (2023-11-02)
+=============================
+
+- GH #4241: Poco::FileInputStream broken in 1.12.5 and 1.11.8
+
+
 Release 1.11.8 (2023-10-18)
 ===========================
 
diff --git a/DLLVersion.rc b/DLLVersion.rc
index f2d10c553d..2d4454eb0d 100644
--- a/DLLVersion.rc
+++ b/DLLVersion.rc
@@ -4,8 +4,8 @@
 
 #include "winres.h"
 
-#define POCO_VERSION 1,11,8,0
-#define POCO_VERSION_STR "1.11.8"
+#define POCO_VERSION 1,11,8,1
+#define POCO_VERSION_STR "1.11.8p1"
 
 VS_VERSION_INFO VERSIONINFO
  FILEVERSION POCO_VERSION
diff --git a/Foundation/include/Poco/Version.h b/Foundation/include/Poco/Version.h
index efa7130de8..ea61958ace 100644
--- a/Foundation/include/Poco/Version.h
+++ b/Foundation/include/Poco/Version.h
@@ -35,7 +35,7 @@
 //      Ax: alpha releases
 //      Bx: beta releases
 //
-#define POCO_VERSION 0x010B0800
+#define POCO_VERSION 0x010B0801
 
 
 #endif // Foundation_Version_INCLUDED
diff --git a/Foundation/src/FileStream.cpp b/Foundation/src/FileStream.cpp
index 158cdb5e85..0ddffe9b0e 100644
--- a/Foundation/src/FileStream.cpp
+++ b/Foundation/src/FileStream.cpp
@@ -39,6 +39,10 @@ FileIOS::~FileIOS()
 void FileIOS::open(const std::string& path, std::ios::openmode mode)
 {
 	clear();
+	if (!(mode & std::ios::in) && !(mode & std::ios::out))
+	{
+		mode |= _defaultMode;
+	}
 	_buf.open(path, mode);
 }
 
@@ -73,7 +77,7 @@ FileInputStream::FileInputStream():
 
 
 FileInputStream::FileInputStream(const std::string& path, std::ios::openmode mode):
-	FileIOS(mode | std::ios::in),
+	FileIOS(std::ios::in),
 	std::istream(&_buf)
 {
 	open(path, mode | std::ios::in);
@@ -93,7 +97,7 @@ FileOutputStream::FileOutputStream():
 
 
 FileOutputStream::FileOutputStream(const std::string& path, std::ios::openmode mode):
-	FileIOS(mode | std::ios::out),
+	FileIOS(std::ios::out),
 	std::ostream(&_buf)
 {
 	open(path, mode | std::ios::out);
@@ -113,7 +117,7 @@ FileStream::FileStream():
 
 
 FileStream::FileStream(const std::string& path, std::ios::openmode mode):
-	FileIOS(mode),
+	FileIOS(std::ios::in | std::ios::out),
 	std::iostream(&_buf)
 {
 	open(path, mode);
diff --git a/VERSION b/VERSION
index 40faed9aa4..745960fa4a 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.11.8
+1.11.8p1
diff --git a/doc/99100-ReleaseNotes.page b/doc/99100-ReleaseNotes.page
index f95091bf71..0f797f754b 100644
--- a/doc/99100-ReleaseNotes.page
+++ b/doc/99100-ReleaseNotes.page
@@ -1,6 +1,13 @@
 POCO C++ Libraries Release Notes
 AAAIntroduction
 
+!!!Release 1.11.8p1
+
+!! Summary of Changes
+
+  - GH #4241: Poco::FileInputStream broken in 1.12.5 and 1.11.8
+
+
 !!!Release 1.11.8
 
 !!Summary of Changes